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List of "PEM Buster" Supplements and Drugs That Reduce or Prevent PEM
Many supplement and drugs appear to be able to inhibit post-exertional malaise (PEM), by either preventing PEM from physical or mental exertion occurring in the first place, or helping to relieve any PEM that has already appeared.
PEM can be caused both by physical exertion, and also by mental exertion (such as heavy mental concentration or hectic social activity). The mechanism of mental exertion-induced PEM may be different to the mechanism of physical exertion-induced PEM.
The PEM reducers ("PEM busters") on this thread were compiled from forum threads detailing ME/CFS patients' experiences with supplements and drugs that they observed reduced or eliminated their PEM.
PEM Reducer Supplements and Drugs
The following are the supplements, drugs and other treatments that ME/CFS patients have found reduce PEM, given in approximate order of efficacy (best PEM busters at the top of the list):
These anti-PEM supplements and drugs are further detailed below.
You can try one or more of the above supplements and drugs during PEM itself, to see if they relieve PEM; or take one in advance of any physical or mental exertion that you suspect is going to trigger PEM, and see if they prevent the PEM from occurring entirely.
Most experienced ME/CFS patients know roughly how long their PEM periods tend to last for, so will certainly notice if a supplement can dramatically shorten the severity or duration of their PEM.
PEM Shielders vs PEM Relievers
A PEM buster supplement or drug may fall into one (or both) of the following two categories:
PEM shielders — help prevent PEM from occurring in the first place. PEM shielders only work properly when taken as a preventative medication before you engage in physical or mental exertion.
PEM relievers — mitigate the severity and duration of PEM only when taken after the exertion has occurred, where the PEM may already have begun to manifest.
It is important to know whether a supplement or drug is a PEM shielder or a PEM reliever, because the former only work when taken before the exertion, and the latter only work when taken after the exertion.
As an example of the difference between a PEM shielder or a PEM reliever, @hamsterman found prednisolone 20 mg is an excellent PEM shielder for both physical and mental exertion, but found it does not work at all as a PEM reliever.
@hamsterman found BCAA, Q10, creatine and baking soda work more as PEM relievers, rather than PEM shielders.
@SOC found Q10 works as a PEM reducer when taken at a very high dose of 2400 mg, but also found Q10 had some PEM shielding effects when taken at 800 mg daily.
ME/CFS Patient Accounts of Various PEM Busters
➤ Corticosteroids
Corticosteroids such as prednisone, prednisolone and hydrocortisone are potent PEM shielders. See the corticosteroids section below for more info.
➤ Pyridostigmine
Some ME/CFS patients find Mestinon (pyridostigmine) taken in doses of around 45 mg x 3 times daily eliminates PEM from physical exercise, see here. Dr David Systrom has a clinical trial of pyridostigmine for ME/CFS.
➤ Cumin (Cuminum cyminum)
@Wishful finds that ground cumin (Cuminum cyminum) effectively blocks physical exercise from causing PEM, as well as reducing any PEM that is already present. So cumin appears to be both a PEM shielder and PEM reliever. He finds just 1 level teaspoon of ground cumin powder blocks PEM for 3 days. This spice contains cuminaldehyde, which has known mitochondrial effects.
@Elike also finds cumin helps prevent PEM, see this post. @seamyb finds ground cumin not only prevents PEM, but also increases energy. @Greenplum finds one teaspoon of cumin every three days helps reduce PEM. @Aspen finds one teaspoon of cumin taken every 1 or 2 days reduces PEM by about 50%.
@ilivewithcfs finds 1 level teaspoon of cumin every other day reduces PEM.
➤ Cannabis
Several ME/CFS patients have reported that cannabis is a good PEM shielder/reliever: they find if cannabis is taken just when the first signs of PEM appear, at the first PEM "danger signals", then cannabis will prevent the PEM from fully manifesting.
Cannabis seems to prevent PEM caused by both physical or mental exertion. Patients report that when they have done too much physical or mental activity, and start to sense the "danger signals" that PEM is about to appear, taking cannabis pulls them out of the danger zone, so that they can escape PEM before it manifests.
Interestingly, some ME/CFS patients report that moderate doses of cannabis do not produce any high at all. This observation is interesting in itself, as cannabis will normally get people high; but the fact that in ME/CFS, moderate doses of cannabis often do not cause any high is intriguing. And this is good news for patients who would like to benefit from the anti-PEM effects of cannabis, but do not want to experience a high just in order to gain these benefits.
To help ensure only moderate doses are taken, Cannabis indica may be the best choice, rather than Cannabis sativa. Indica has less of the THC that gets you high, and more of the CBD which acts to counter some of the effects of THC. Whereas by comparison, sativa has more THC and less CBD.
Of course, the legality of cannabis varies from region to region, but this option of using moderate dose of a mild cannabis like Indica to prevent PEM is another useful addition to the list of medications that reduce PEM.
In terms of why cannabis has this anti-PEM effect, this article says the THC and CBD active principles in cannabis can affect mitochondria: cannabinoid type 1 receptors (CB1) are found on mitochondria, and THC is an agonist of the CB1 receptor, whereas CBD is an antagonist of this receptor. So maybe that is how cannabis helps avoid PEM, by modulating mitochondrial function.
➤ Rapamycin
One ME/CFS patient reported that the immunosuppressive drug rapamycin abolished PEM from physical exertion at doses of 4 mg once weekly.
➤ Benzodiazepines
There are several reports of benzodiazepines being effective for PEM.
➤ Dextromethorphan
According to Dr Brayden Yellman of the Bateman Horne Center, dextromethorphan (which is found in cough syrup) is a PEM shielder when taken before exertion, or just after the exertion. Refs: here and here.
➤ D-ribose
This post details how D-ribose powder, at the standard dose of 5 grams taken three times daily, consistently curtails PEM from its usual 3 or 4 days, down to just 12 to 24 hours, for ME/CFS patient @arewenearlythereyet.
➤ Branched-Chain Amino Acids (BCAA)
Here is a thread detailing the anti-PEM effects of branched-chain amino acids (BCAAs), at a dose of around 5 grams daily in the morning. @Mary says later in this thread that BCAAs reduce her PEM duration from 2 days to 1 day. It may be the isoleucine in BCAAs that is responsible for the bulk of the anti-PEM affects, as isoleucine significantly increases glucose uptake. See this post. BCAAs have been proposed to alleviate exercise-induced fatigue. Ref: 1
➤ Q10
This post details how for ME/CFS patient @SOC, a very high one-off dose of 2400 mg of co-enzyme Q10 (taken as two 1200 mg doses on the same day) dramatically eliminated a PEM period with 24 hours, a PEM that would normally have lasted 10 to 14 days. The patient also found that 800 mg of Q10 taken daily noticeably raised their PEM threshold (see this post). Cheap sources of bulk Q10 powder are found on purebulk.com.
If you are going try high doses of Q10, you may be better off taking the ubiquinol form, not the more common and cheaper ubiquinone form. This is because blood levels of ubiquinol will continue to rise with increasing dose levels; by contrast, if you take ubiquinone, the blood levels of Q10 will eventually begin to flatten out with increasing dosage. Ref: here.
Note that this study found 3000 mg of Q10 daily for 8 months was safe.
➤ Sodium Bicarbonate, Catalase and Glutathione
Here is a thread detailing the anti-PEM effects of sodium bicarbonate, catalase, glutathione and others. In the thread, @Mya Symons says that sodium bicarbonate taken just before exercise, and 600 mg of catalase taken just after exercise, has the best anti-PEM effect.
➤ Citrate
Citrate supplements (such as sodium citrate or potassium citrate) may be an alternative to sodium bicarbonate; see @Mel9's post below. I would think you need to use doses around 3 grams or so (the sort of dose used for alkalizing). Citrate has the advantage that you can take in on a full stomach, and it will not reduce stomach acid levels (bicarbonate is best not taken when you are digesting food).
➤ Creatine
This post details how regular supplementation with creatine monohydrate 10 grams daily increased energy, and allowed ME/CFS patient @TravelChimp to do much more physical exercise before the PEM was triggered; in other words, this patient found the creatine raised their PEM threshold. Not only that, but when they did get PEM by overdoing it, they noticed their PEM was reduced in severity as a result of the creatine supplementation.
Note that creatine hydrochloride 2 grams daily may be a much better form of creatine to use than creatine monohydrate, as creatine HCl does not cause stomach aches or fluid retention (as the monohydrate form can), and also is much more water soluble and absorbable in the gut, and so you only need to take around ⅕ of the dose (so 10 grams of creatine monohydrate = 2 grams of creatine hydrochloride; ref: 1).
➤ Cold Therapy
Here is a post detailing the anti-PEM effects of cold therapy (cold baths or swimming in cold water). @helen1 finds PEM symptoms decrease significantly after cold therapy, especially nausea and weak legs, and finds it is most effective if you catch the PEM early.
➤ Chinese Skullcap
@msf found that Chinese skullcap root is a good PEM shielder, at a dose of 3 to 6 grams, taken two to three times daily.
One review paper says both baicalin and baicalein (found in Chinese skullcap) and protect mitochondria from oxidative stress. And one study found baicalin restored the infection-triggered decrease in mitochondrial complex V (aka: ATP synthase, or ATPase). Mitochondrial complex V (ATP synthase) has been found deficient in ME/CFS. This might explain the anti-PEM effect of Chinese skullcap root.
Chinese skullcap root contains 8 to 16% of baicalin, and 0.2% to 1.2% of baicalein. Ref: 1 So 5 grams of root corresponds to about 500 mg of baicalin. Note that you can buy 95% pure baicalin from LifeMode, costing $19 for 20 grams. Baicalin bioavailability in rats 2.2%, and half-life around 10 hours. Ref: 1 In the body, baicalin converts into baicalein. Ref: 1
➤ Dimenhydrinate
This post details how the over-the-counter first-generation antihistamine dimenhydrinate (Dramamine), which is normally used to prevent nausea and vomiting due to motion sickness, is effective for treating the PEM that ME/CFS patient @ilivewithcfs usually experiences after using public transport.
Studies on PEM Buster Supplements
Athletic performance studies which demonstrate how these PEM reducing supplements also generally improve exercise performance are given in this post. These studies are also listed in Cort's excellent resource about PEM reducers found here.
These athletic performance studies found that the very same supplements that ME/CFS patients on this forum have found prevent or relieve PEM also reduce the recovery period after athletic exercise in healthy people. Several of these studies found that the athletic performance-enhancing supplements work via neutralizing exercise-induced lactate circulating in the blood, and this is probably one of the mechanism by which they reduce PEM.
Biochemical Theory of PEM: How the PEM Busters Work
The PEM reducer supplements and drugs detailed in this post were discovered by various ME/CFS patients on this forum, who observed that a supplement or drug they were taking had anti-PEM effects.
Interestingly, many of these PEM buster supplements —namely creatine, citrulline, BCAA, Q10, bicarbonate and glutathione — are shown in studies to inhibit exercise-induced lactate. See the athletic exercise performance studies in this post. So lactate inhibition may be the mechanism of action of these PEM busters. Lactate inhibition probably does not apply to D-ribose, cannabis or corticosteroids, which likely reduce PEM by other mechanisms.
D-ribose may work by helping to replace ATP molecules that may be lost during significant exertion: in the theory of PEM proposed by Myhill, Booth and McLaren-Howard (briefly explained in this post), it is suggested that PEM is caused by the loss of ATP molecules that occurs when ME/CFS patients exercise.
According to this theory, you only get over PEM once the body re-manufactures the lost ATP molecules, which can take many days or weeks — hence why PEM can last for days or weeks. D-ribose speeds up the process of re-manufacturing the lost ATP molecules, thus curtailing the duration of PEM.
Myhill, Booth and McLaren-Howard's theory also proposes that a build up of lactic acid during exercise exacerbates and worsens PEM (since lactic acid requires a lot of energy to clear from the body); so that might explain why the above supplements which reduce exercise-induced lactate are PEM relievers: they can help ME/CFS patients get over PEM more quickly.
Their theory suggests that lactic acid is not the initial cause of PEM (that's due to a shortage of ATP molecules which deliver energy), but lactic acid build-up from exercise further compounds the energy shortage problem of PEM, because to clear lactic acid by converting it back to glucose, it requires considerably more energy than was originally gained from the conversion of glucose to lactic acid.
Corticosteroids as Potent PEM Shielders
Corticosteroids such as prednisone, prednisolone and hydrocortisone are reported to be potent PEM shielders. When normal doses of these corticosteroids are taken around one or two hours before any physical or mental exertion, they can totally prevent any PEM from later appearing.
But these drugs were found to be useless if taken after the exertion. That is, they do not help if you are already experiencing PEM from a previous period of exertion.
Note that it is normal doses of corticosteroids (eg, prednisolone 20 mg, or hydrocortisone 80 mg) that can prevent PEM, not the low doses (eg, prednisolone 5 mg, or hydrocortisone 20 mg) that some ME/CFS patients take daily.
And note that normal doses of corticosteroids should only be used occasionally in ME/CFS, perhaps as a maximum of once a week. If normal doses are used every day on a long term basis, this can lead to worsening of ME/CFS (possibly because the corticosteroid Th1 immune suppression may allow any underlying viral infections to proliferate).
Note also that in some people, corticosteroids may raise heart rate, and this might trigger rather than prevent PEM. See this post.
Examples of ME/CFS patients using corticosteroids to prevent PEM:
▶︎ @Patrick* found that prednisone at a dose of 20 mg taken a just before a mentally exerting event (such as socializing) was effective at relieving ME/CFS symptoms. Sometimes he would take another 20 mg later in the day. Other ME/CFS patients have vouched this works effectively and reliably (though others report ill effects from this corticosteroid drug). Note that this dosing is only used as a one-off, not regularly every day.
▶︎ @hamsterman found hydrocortisone at a one-off dose of 80 mg (or alternatively and equivalently prednisolone 20 mg) taken 30 minutes before a mentally or physically exerting event very effective for preventing PEM due to physical and mental exertion:
Note that @hamsterman said he has the autoimmune disease Crohn's, which causes has extreme fatigue, though thinks he may have ME/CFS as well.
▶︎ @gregh286 found prednisone will block PEM from appearing.
How long for the corticosteroid PEM shield to kick in? Prednisone takes around 2.6 hours for the drug to reach peak levels in the bloodstream, whereas prednisolone is faster, taking only around 1.3 hours. Hydrocortisone takes around 1 to 2 hours. Ref: 1
So when taking any of these corticosteroids in advance to prevent PEM from a physical or mental exertion you are about to perform, give these drugs enough time to kick in before starting the exertion, else your PEM shield will not be in place. CAUTION: note that there are also timed release versions of prednisone, which only slowly release the drug into your system over several hours, so it might be best to avoid these.
What is the dose equivalence of different corticosteroids? Difference corticosteroid drugs have different strengths: hydrocortisone 80 mg = prednisone 20 mg = prednisolone 20 mg = methylprednisolone 16 mg = triamcinolone 16 mg = dexamethasone 3 mg = betamethasone 2.4 mg. Source: here.
How long does the corticosteroid PEM shield last? In terms of how long the "PEM shield" lasts, the plasma half-life of prednisone and prednisolone is 3 to 4 hours, and the plasma half-life of hydrocortisone is 2 hours. So once your "PEM shield" is active it will last for say one or two half-lives, ie, your PEM shield may last about 4 to 8 hours for prednisone and prednisolone, and last around 2 to 4 hours for hydrocortisone.
When taking prednisone 20 mg, @hamsterman found its PEM protection lasted for as long as 8 hours; but when he tried exercising 13 hours after his prednisone, then he crashed. So for a single 20 mg dose of prednisone, around 8 hours would seem the limit of its protective effects. Of course you could take a second 20 mg dose at the 8 hour point, and get another 8 hours of protection.
Efficacy of the corticosteroid PEM shield. This is how effective @hamsterman found a one-off dose of prednisolone 20 mg to be at completely eliminating PEM from a major physical workout at the gym:
Corticosteroids may lead to major problems if taken daily for weeks in a row. If corticosteroids are used every day on a long term basis of weeks, this can lead to worsening of ME/CFS, perhaps because the immune suppression from the corticosteroids may allow any underlying infections to proliferate (corticosteroids reduce the antiviral Th1 response, reduce T-cell function, and increase the antibacterial Th2 response).
See the warning in this post, which cautions against using prednisone for any extended period of time, and warns that the PEM protective effects do not work for the whole day, they seem to wear off after about 6 to 8 hours. Prednisone is a strong drug, and has sometimes caused adverse events in ME/CFS patients.
Dr Chia says two ME/CFS patients who took prednisone daily for two weeks remarkably improved; but when they tapered off they got much worse, and ended up in the hospital. He believes it such extended use of corticosteroids allows enterovirus to proliferate.
The mechanism by which corticosteroids provide a potent PEM shield may relate to their effects on energy metabolism and mitochondrial oxidative phosphorylation. Mitochondria possess a glucocorticoid receptor, and that receptor regulates oxidative phosphorylation. Refs: 1 2
Interestingly, the over-the-counter drug theophylline greatly potentiates the anti-inflammatory effects of corticosteroids. Ref: 1 In this study of adding theophylline to the corticosteroid regimen of asthma patients, they used a dose of 250 mg of theophylline daily. Theophylline also has a vasoconstriction effect, and is thus useful for POTS, to reduce blood pooling in the legs on standing. Whether theophylline would help ME/CFS patients get the same anti-PEM effects from lower doses of corticosteroids remains to be seen.
Many supplement and drugs appear to be able to inhibit post-exertional malaise (PEM), by either preventing PEM from physical or mental exertion occurring in the first place, or helping to relieve any PEM that has already appeared.
PEM can be caused both by physical exertion, and also by mental exertion (such as heavy mental concentration or hectic social activity). The mechanism of mental exertion-induced PEM may be different to the mechanism of physical exertion-induced PEM.
The PEM reducers ("PEM busters") on this thread were compiled from forum threads detailing ME/CFS patients' experiences with supplements and drugs that they observed reduced or eliminated their PEM.
PEM Reducer Supplements and Drugs
The following are the supplements, drugs and other treatments that ME/CFS patients have found reduce PEM, given in approximate order of efficacy (best PEM busters at the top of the list):
- Corticosteroids — taken before exertion can completely prevent PEM; see the corticosteroids section. below.
- Mestinon (pyridostigmine) around 45 mg x 3 times daily— helps some patients entirely avoid PEM.
- Cumin (Cuminum cyminum) — level teaspoon of cumin powder; effects last for 3 days.
- Cannabis — taken just as PEM begins to appear prevents PEM from fully manifesting; see the cannabis section below.
- Rapamycin — 4 mg once weekly.
- Benzodiazepines
- Dextromethorphan — standard dosing
- D-ribose — 5 grams, three times daily.
- Branched-chain amino acids (BCAA) — 5 grams.
- Co-enzyme Q10 — 800 mg to 1800 mg (this is a very high dose of Q10).
- Sodium bicarbonate (baking soda) — 2 grams (half of a level teaspoon).
- Citrate supplements — 3 grams.
- Creatine hydrochloride — 2 grams.
- Citrulline — 1000 mg.
- Catalase — 600 mg (taken after exercise).
- Cold therapy — such as a cold bath.
- Chinese skullcap root (Scutellaria baicalensis) — 3 to 6 grams, taken two to three times daily
- Dimenhydrinate — 100 mg
These anti-PEM supplements and drugs are further detailed below.
You can try one or more of the above supplements and drugs during PEM itself, to see if they relieve PEM; or take one in advance of any physical or mental exertion that you suspect is going to trigger PEM, and see if they prevent the PEM from occurring entirely.
Most experienced ME/CFS patients know roughly how long their PEM periods tend to last for, so will certainly notice if a supplement can dramatically shorten the severity or duration of their PEM.
PEM Shielders vs PEM Relievers
A PEM buster supplement or drug may fall into one (or both) of the following two categories:
PEM shielders — help prevent PEM from occurring in the first place. PEM shielders only work properly when taken as a preventative medication before you engage in physical or mental exertion.
PEM relievers — mitigate the severity and duration of PEM only when taken after the exertion has occurred, where the PEM may already have begun to manifest.
It is important to know whether a supplement or drug is a PEM shielder or a PEM reliever, because the former only work when taken before the exertion, and the latter only work when taken after the exertion.
As an example of the difference between a PEM shielder or a PEM reliever, @hamsterman found prednisolone 20 mg is an excellent PEM shielder for both physical and mental exertion, but found it does not work at all as a PEM reliever.
@hamsterman found BCAA, Q10, creatine and baking soda work more as PEM relievers, rather than PEM shielders.
@SOC found Q10 works as a PEM reducer when taken at a very high dose of 2400 mg, but also found Q10 had some PEM shielding effects when taken at 800 mg daily.
ME/CFS Patient Accounts of Various PEM Busters
➤ Corticosteroids
Corticosteroids such as prednisone, prednisolone and hydrocortisone are potent PEM shielders. See the corticosteroids section below for more info.
➤ Pyridostigmine
Some ME/CFS patients find Mestinon (pyridostigmine) taken in doses of around 45 mg x 3 times daily eliminates PEM from physical exercise, see here. Dr David Systrom has a clinical trial of pyridostigmine for ME/CFS.
➤ Cumin (Cuminum cyminum)
@Wishful finds that ground cumin (Cuminum cyminum) effectively blocks physical exercise from causing PEM, as well as reducing any PEM that is already present. So cumin appears to be both a PEM shielder and PEM reliever. He finds just 1 level teaspoon of ground cumin powder blocks PEM for 3 days. This spice contains cuminaldehyde, which has known mitochondrial effects.
@Elike also finds cumin helps prevent PEM, see this post. @seamyb finds ground cumin not only prevents PEM, but also increases energy. @Greenplum finds one teaspoon of cumin every three days helps reduce PEM. @Aspen finds one teaspoon of cumin taken every 1 or 2 days reduces PEM by about 50%.
@ilivewithcfs finds 1 level teaspoon of cumin every other day reduces PEM.
➤ Cannabis
Several ME/CFS patients have reported that cannabis is a good PEM shielder/reliever: they find if cannabis is taken just when the first signs of PEM appear, at the first PEM "danger signals", then cannabis will prevent the PEM from fully manifesting.
Cannabis seems to prevent PEM caused by both physical or mental exertion. Patients report that when they have done too much physical or mental activity, and start to sense the "danger signals" that PEM is about to appear, taking cannabis pulls them out of the danger zone, so that they can escape PEM before it manifests.
Interestingly, some ME/CFS patients report that moderate doses of cannabis do not produce any high at all. This observation is interesting in itself, as cannabis will normally get people high; but the fact that in ME/CFS, moderate doses of cannabis often do not cause any high is intriguing. And this is good news for patients who would like to benefit from the anti-PEM effects of cannabis, but do not want to experience a high just in order to gain these benefits.
To help ensure only moderate doses are taken, Cannabis indica may be the best choice, rather than Cannabis sativa. Indica has less of the THC that gets you high, and more of the CBD which acts to counter some of the effects of THC. Whereas by comparison, sativa has more THC and less CBD.
Of course, the legality of cannabis varies from region to region, but this option of using moderate dose of a mild cannabis like Indica to prevent PEM is another useful addition to the list of medications that reduce PEM.
In terms of why cannabis has this anti-PEM effect, this article says the THC and CBD active principles in cannabis can affect mitochondria: cannabinoid type 1 receptors (CB1) are found on mitochondria, and THC is an agonist of the CB1 receptor, whereas CBD is an antagonist of this receptor. So maybe that is how cannabis helps avoid PEM, by modulating mitochondrial function.
➤ Rapamycin
One ME/CFS patient reported that the immunosuppressive drug rapamycin abolished PEM from physical exertion at doses of 4 mg once weekly.
➤ Benzodiazepines
There are several reports of benzodiazepines being effective for PEM.
➤ Dextromethorphan
According to Dr Brayden Yellman of the Bateman Horne Center, dextromethorphan (which is found in cough syrup) is a PEM shielder when taken before exertion, or just after the exertion. Refs: here and here.
➤ D-ribose
This post details how D-ribose powder, at the standard dose of 5 grams taken three times daily, consistently curtails PEM from its usual 3 or 4 days, down to just 12 to 24 hours, for ME/CFS patient @arewenearlythereyet.
➤ Branched-Chain Amino Acids (BCAA)
Here is a thread detailing the anti-PEM effects of branched-chain amino acids (BCAAs), at a dose of around 5 grams daily in the morning. @Mary says later in this thread that BCAAs reduce her PEM duration from 2 days to 1 day. It may be the isoleucine in BCAAs that is responsible for the bulk of the anti-PEM affects, as isoleucine significantly increases glucose uptake. See this post. BCAAs have been proposed to alleviate exercise-induced fatigue. Ref: 1
➤ Q10
This post details how for ME/CFS patient @SOC, a very high one-off dose of 2400 mg of co-enzyme Q10 (taken as two 1200 mg doses on the same day) dramatically eliminated a PEM period with 24 hours, a PEM that would normally have lasted 10 to 14 days. The patient also found that 800 mg of Q10 taken daily noticeably raised their PEM threshold (see this post). Cheap sources of bulk Q10 powder are found on purebulk.com.
If you are going try high doses of Q10, you may be better off taking the ubiquinol form, not the more common and cheaper ubiquinone form. This is because blood levels of ubiquinol will continue to rise with increasing dose levels; by contrast, if you take ubiquinone, the blood levels of Q10 will eventually begin to flatten out with increasing dosage. Ref: here.
Note that this study found 3000 mg of Q10 daily for 8 months was safe.
➤ Sodium Bicarbonate, Catalase and Glutathione
Here is a thread detailing the anti-PEM effects of sodium bicarbonate, catalase, glutathione and others. In the thread, @Mya Symons says that sodium bicarbonate taken just before exercise, and 600 mg of catalase taken just after exercise, has the best anti-PEM effect.
➤ Citrate
Citrate supplements (such as sodium citrate or potassium citrate) may be an alternative to sodium bicarbonate; see @Mel9's post below. I would think you need to use doses around 3 grams or so (the sort of dose used for alkalizing). Citrate has the advantage that you can take in on a full stomach, and it will not reduce stomach acid levels (bicarbonate is best not taken when you are digesting food).
➤ Creatine
This post details how regular supplementation with creatine monohydrate 10 grams daily increased energy, and allowed ME/CFS patient @TravelChimp to do much more physical exercise before the PEM was triggered; in other words, this patient found the creatine raised their PEM threshold. Not only that, but when they did get PEM by overdoing it, they noticed their PEM was reduced in severity as a result of the creatine supplementation.
Note that creatine hydrochloride 2 grams daily may be a much better form of creatine to use than creatine monohydrate, as creatine HCl does not cause stomach aches or fluid retention (as the monohydrate form can), and also is much more water soluble and absorbable in the gut, and so you only need to take around ⅕ of the dose (so 10 grams of creatine monohydrate = 2 grams of creatine hydrochloride; ref: 1).
➤ Cold Therapy
Here is a post detailing the anti-PEM effects of cold therapy (cold baths or swimming in cold water). @helen1 finds PEM symptoms decrease significantly after cold therapy, especially nausea and weak legs, and finds it is most effective if you catch the PEM early.
➤ Chinese Skullcap
@msf found that Chinese skullcap root is a good PEM shielder, at a dose of 3 to 6 grams, taken two to three times daily.
One review paper says both baicalin and baicalein (found in Chinese skullcap) and protect mitochondria from oxidative stress. And one study found baicalin restored the infection-triggered decrease in mitochondrial complex V (aka: ATP synthase, or ATPase). Mitochondrial complex V (ATP synthase) has been found deficient in ME/CFS. This might explain the anti-PEM effect of Chinese skullcap root.
Chinese skullcap root contains 8 to 16% of baicalin, and 0.2% to 1.2% of baicalein. Ref: 1 So 5 grams of root corresponds to about 500 mg of baicalin. Note that you can buy 95% pure baicalin from LifeMode, costing $19 for 20 grams. Baicalin bioavailability in rats 2.2%, and half-life around 10 hours. Ref: 1 In the body, baicalin converts into baicalein. Ref: 1
➤ Dimenhydrinate
This post details how the over-the-counter first-generation antihistamine dimenhydrinate (Dramamine), which is normally used to prevent nausea and vomiting due to motion sickness, is effective for treating the PEM that ME/CFS patient @ilivewithcfs usually experiences after using public transport.
Studies on PEM Buster Supplements
Athletic performance studies which demonstrate how these PEM reducing supplements also generally improve exercise performance are given in this post. These studies are also listed in Cort's excellent resource about PEM reducers found here.
These athletic performance studies found that the very same supplements that ME/CFS patients on this forum have found prevent or relieve PEM also reduce the recovery period after athletic exercise in healthy people. Several of these studies found that the athletic performance-enhancing supplements work via neutralizing exercise-induced lactate circulating in the blood, and this is probably one of the mechanism by which they reduce PEM.
Biochemical Theory of PEM: How the PEM Busters Work
The PEM reducer supplements and drugs detailed in this post were discovered by various ME/CFS patients on this forum, who observed that a supplement or drug they were taking had anti-PEM effects.
Interestingly, many of these PEM buster supplements —namely creatine, citrulline, BCAA, Q10, bicarbonate and glutathione — are shown in studies to inhibit exercise-induced lactate. See the athletic exercise performance studies in this post. So lactate inhibition may be the mechanism of action of these PEM busters. Lactate inhibition probably does not apply to D-ribose, cannabis or corticosteroids, which likely reduce PEM by other mechanisms.
D-ribose may work by helping to replace ATP molecules that may be lost during significant exertion: in the theory of PEM proposed by Myhill, Booth and McLaren-Howard (briefly explained in this post), it is suggested that PEM is caused by the loss of ATP molecules that occurs when ME/CFS patients exercise.
According to this theory, you only get over PEM once the body re-manufactures the lost ATP molecules, which can take many days or weeks — hence why PEM can last for days or weeks. D-ribose speeds up the process of re-manufacturing the lost ATP molecules, thus curtailing the duration of PEM.
Myhill, Booth and McLaren-Howard's theory also proposes that a build up of lactic acid during exercise exacerbates and worsens PEM (since lactic acid requires a lot of energy to clear from the body); so that might explain why the above supplements which reduce exercise-induced lactate are PEM relievers: they can help ME/CFS patients get over PEM more quickly.
Their theory suggests that lactic acid is not the initial cause of PEM (that's due to a shortage of ATP molecules which deliver energy), but lactic acid build-up from exercise further compounds the energy shortage problem of PEM, because to clear lactic acid by converting it back to glucose, it requires considerably more energy than was originally gained from the conversion of glucose to lactic acid.
Corticosteroids as Potent PEM Shielders
Corticosteroids such as prednisone, prednisolone and hydrocortisone are reported to be potent PEM shielders. When normal doses of these corticosteroids are taken around one or two hours before any physical or mental exertion, they can totally prevent any PEM from later appearing.
But these drugs were found to be useless if taken after the exertion. That is, they do not help if you are already experiencing PEM from a previous period of exertion.
Note that it is normal doses of corticosteroids (eg, prednisolone 20 mg, or hydrocortisone 80 mg) that can prevent PEM, not the low doses (eg, prednisolone 5 mg, or hydrocortisone 20 mg) that some ME/CFS patients take daily.
And note that normal doses of corticosteroids should only be used occasionally in ME/CFS, perhaps as a maximum of once a week. If normal doses are used every day on a long term basis, this can lead to worsening of ME/CFS (possibly because the corticosteroid Th1 immune suppression may allow any underlying viral infections to proliferate).
Note also that in some people, corticosteroids may raise heart rate, and this might trigger rather than prevent PEM. See this post.
Examples of ME/CFS patients using corticosteroids to prevent PEM:
▶︎ @Patrick* found that prednisone at a dose of 20 mg taken a just before a mentally exerting event (such as socializing) was effective at relieving ME/CFS symptoms. Sometimes he would take another 20 mg later in the day. Other ME/CFS patients have vouched this works effectively and reliably (though others report ill effects from this corticosteroid drug). Note that this dosing is only used as a one-off, not regularly every day.
▶︎ @hamsterman found hydrocortisone at a one-off dose of 80 mg (or alternatively and equivalently prednisolone 20 mg) taken 30 minutes before a mentally or physically exerting event very effective for preventing PEM due to physical and mental exertion:
Correction: @hamsterman told me he was actually using prednisolone and not prednisone as he stated in the quote above. The former takes effect faster.I tested it [hydrocortisone] with 80 mgs (equiv. to 20 mgs prednisone), and used it 30 minutes prior to 4 different situations which always cause PEM 1) Doctors visit, 2) engaging chat with friend 3) cardio workout 4) another chat with a different friend. Each time, no PEM.
Just as with prednisone, its useless if taken after the exertion, it does nothing if you are already experiencing PEM, is not meant to be taken daily,
But unlike prednisone, it [hydrocortisone] doesnt stay in the system for very long, so after a couple hours or so, it is no longer active. But this can be an advantage, since it can be used more strategically... and more often.... potentially multiple times per week,
Note that @hamsterman said he has the autoimmune disease Crohn's, which causes has extreme fatigue, though thinks he may have ME/CFS as well.
▶︎ @gregh286 found prednisone will block PEM from appearing.
How long for the corticosteroid PEM shield to kick in? Prednisone takes around 2.6 hours for the drug to reach peak levels in the bloodstream, whereas prednisolone is faster, taking only around 1.3 hours. Hydrocortisone takes around 1 to 2 hours. Ref: 1
So when taking any of these corticosteroids in advance to prevent PEM from a physical or mental exertion you are about to perform, give these drugs enough time to kick in before starting the exertion, else your PEM shield will not be in place. CAUTION: note that there are also timed release versions of prednisone, which only slowly release the drug into your system over several hours, so it might be best to avoid these.
What is the dose equivalence of different corticosteroids? Difference corticosteroid drugs have different strengths: hydrocortisone 80 mg = prednisone 20 mg = prednisolone 20 mg = methylprednisolone 16 mg = triamcinolone 16 mg = dexamethasone 3 mg = betamethasone 2.4 mg. Source: here.
How long does the corticosteroid PEM shield last? In terms of how long the "PEM shield" lasts, the plasma half-life of prednisone and prednisolone is 3 to 4 hours, and the plasma half-life of hydrocortisone is 2 hours. So once your "PEM shield" is active it will last for say one or two half-lives, ie, your PEM shield may last about 4 to 8 hours for prednisone and prednisolone, and last around 2 to 4 hours for hydrocortisone.
When taking prednisone 20 mg, @hamsterman found its PEM protection lasted for as long as 8 hours; but when he tried exercising 13 hours after his prednisone, then he crashed. So for a single 20 mg dose of prednisone, around 8 hours would seem the limit of its protective effects. Of course you could take a second 20 mg dose at the 8 hour point, and get another 8 hours of protection.
Efficacy of the corticosteroid PEM shield. This is how effective @hamsterman found a one-off dose of prednisolone 20 mg to be at completely eliminating PEM from a major physical workout at the gym:
Note that @hamsterman was using prednisolone and not prednisone as he stated in the quote above. Interestingly enough, after doing this intense cardiovascular exercise once weekly for a year, courtesy of the PEM shielding provided by corticosteroids, @hamsterman was able to completely cure his POTS (see here). But his ME/CFS has not improved through exercise. POTS is known to responds well to exercise, whereas ME/CFS does not.Just as a side note, I've been using Prednisone once a week for about a year, and I've found its absolutely impossible to induce PEM while Im on these corticosteroids. I've really taken this to the limit.... doing crazy cardio... things that would normally cause severe multi-week PEM... and each time... nothing. I've also accidentally done a 'double-blind' test, when I accidentally took the wrong medication, and had severe PEM afterwards.
Corticosteroids may lead to major problems if taken daily for weeks in a row. If corticosteroids are used every day on a long term basis of weeks, this can lead to worsening of ME/CFS, perhaps because the immune suppression from the corticosteroids may allow any underlying infections to proliferate (corticosteroids reduce the antiviral Th1 response, reduce T-cell function, and increase the antibacterial Th2 response).
See the warning in this post, which cautions against using prednisone for any extended period of time, and warns that the PEM protective effects do not work for the whole day, they seem to wear off after about 6 to 8 hours. Prednisone is a strong drug, and has sometimes caused adverse events in ME/CFS patients.
Dr Chia says two ME/CFS patients who took prednisone daily for two weeks remarkably improved; but when they tapered off they got much worse, and ended up in the hospital. He believes it such extended use of corticosteroids allows enterovirus to proliferate.
The mechanism by which corticosteroids provide a potent PEM shield may relate to their effects on energy metabolism and mitochondrial oxidative phosphorylation. Mitochondria possess a glucocorticoid receptor, and that receptor regulates oxidative phosphorylation. Refs: 1 2
Interestingly, the over-the-counter drug theophylline greatly potentiates the anti-inflammatory effects of corticosteroids. Ref: 1 In this study of adding theophylline to the corticosteroid regimen of asthma patients, they used a dose of 250 mg of theophylline daily. Theophylline also has a vasoconstriction effect, and is thus useful for POTS, to reduce blood pooling in the legs on standing. Whether theophylline would help ME/CFS patients get the same anti-PEM effects from lower doses of corticosteroids remains to be seen.
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