Sugar-Coated Shackles: Could Sugar-Coated Pills Trigger M.E. Symptoms?

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Could the shiny coating on your pills be worsening your M.E. symptoms?

Introduction

Myalgic Encephalomyelitis (M.E.) is a debilitating condition affecting thousands in the UK, with no known cause or cure. I propose a hypothesis: sugar-coated pills, like glossy painkillers, contraceptives, and other over-the-counter remedies, might trigger M.E. symptoms in some people, similar to allergies or food sensitivities. As someone with M.E., I’ve noticed this pattern in my own life and want to share it with the UK M.E. community to see if others have similar experiences.

Personal Experience

For 25 years, I’ve lived with intermittent M.E. symptoms—profound fatigue, weak limbs, neck weakness, body aches, and brain fog. I’ve noticed a clear pattern: these symptoms flare up about three days after taking sugar-coated pills (e.g., over-the-counter painkillers or laxatives) and fade days after stopping them. This has happened repeatedly, leading me to suspect the shiny coating—possibly shellac, a common ingredient also found in varnishes, cosmetics, and confectionery. Shellac in pills seems to affect me most consistently.

Fifteen years ago, I applied shop-bought nail varnish and instantly felt unwell—hand spasticity, brain fog, and a sense my brain was caving in. Removing it cleared my symptoms within hours. Months later, varnishing my pine floor caused similar issues (hand spasticity, leg weakness, swallowing difficulties) when fumes were created when heated by a radiator, mimicking early Motor Neurone Disease. Placing a rug between the radiator and floor reduced the fumes, and fresh air cleared my symptoms. I suspect shellac in both cases, linking to my M.E. flares from sugar-coated pills. Is this a quirky allergy unique to me, or are others affected? I need your help to find out.

Historical Context

The unpopular term “Yuppie Flu” emerged in the 1980s to describe M.E. like symptoms among young, upwardly mobile women. This coincided with the widespread use of sugar-coated oral contraceptives, popular among this group. Could these coatings have triggered symptoms in predisposed individuals? This idea is speculative but merits exploration.

Similarly, the 1955 Royal Free Hospital outbreak, where over 300 staff developed M.E.-like symptoms, aligns with the introduction of Panadol, a paracetamol-based painkiller launched in UK hospitals that year. Initially prescription-only, Panadol was marketed as gentle on the stomach, possibly due to a sugar coating (pending confirmation). While there’s no direct evidence Panadol was used during the outbreak, its hospital availability makes it a plausible candidate for fever or pain management. I’m researching historical records and welcome insights from former staff or relatives to clarify this link.

Why This Matters

If sugar-coated pills are a trigger, avoiding them could prevent symptom flares for some M.E. patients. This simple, testable idea aligns with the notion that M.E. involves heightened sensitivity to environmental factors, like allergies.

Call to Action

I’m reaching out to the UK M.E. community to explore this hypothesis. Have you noticed M.E. symptoms flaring 2–5 days after taking sugar-coated pills, such as painkillers or contraceptives? If so, what happened when you switched to non-coated alternatives? Please share your experiences in the replies below. Together, we can collect anecdotal data to see if this pattern holds and decide whether to pursue further research, either as a community or with professional researchers.

Next Steps

Check your medicine cabinet for sugar-coated pills (shiny, glossy tablets). Swap them for non-coated tablets or capsules. Labels often don’t specify coatings, so ask your pharmacist if unsure.

Important: Don’t stop prescription medications without consulting your GP. If your pills are sugar-coated, your GP can suggest non-coated alternatives.

Keep a diary of when you stop taking sugar-coated pills and note symptom changes. My symptoms improved days after stopping, but I’d taken them briefly. If you’ve used these pills long-term, recovery might differ—your input is vital.

I’m a retired registered mental health nurse with a lifetime of experience and a Master’s Degree in Counselling. Your insights could help unravel a piece of the M.E. puzzle.

Acknowledgments

Thank you to the UK M.E. community for your resilience and advocacy. This work is inspired by our shared journey toward answers.

Note: This is a hypothesis based on personal observation, not a proven theory. Always consult a healthcare professional before changing medication.

References


Underhill, R., & Baillod, R. (2021). Myalgic Encephalomyelitis/Chronic Fatigue Syndrome: Organic Disease or Psychosomatic Illness? A Re-Examination of the Royal Free Epidemic of 1955. Medicina, 57(1), 12. https://dx.doi.org/10.3390/medicina57010012
 

Wishful

Senior Member
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I think you're confusing products. Shellac is used for pill coatings, but nail polish I think isn't based on shellac (there's a brand name of "Shellac" nail varnish that I think doesn't contain shellac). Shellac was used for floor varnish long ago, but most products now use synthetic resins., and even if it was in the new floor varnish, shellac isn't volatile, so you wouldn't breathe it in (unless you abraded the hardened form). You would breathe in hydrocarbons, ketones, and other potentially toxic chemicals.

Intolerance of shellac is easy to test: just order some pure shellac flakes (woodworking supplies).
 
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Sorry about the confusion Wishful and thanks for your input. I've been using AI to clarify matters concerning this research, and they said that Shellac was a common ingredient in varnishes and cosmetics to create shine. The problem with Shellac is it is considered so harmless as to not even warrant a mention, for instance in the shine they put on oranges or some shiny donuts and other confectionary, but I hear what you are saying.

Thats why Im asking for others to share their experiences. And you're right that i may be getting the Shellac connection wrong as there are about a half a dozen ingredients in coated tablets and maybe it is something else. All I know is if I take these tablets for more than a couple of days, I'm on the floor. And although the symptoms were similar with the nail varnish and floor varnish, it may have been some other ingredient. Do you use sugar coated tablets yourself?
 
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@Wishful I've fully taken on board your comments about the Shellac in varnishes, suggesting my theory is a bit flaky and lacks polish lol (sorry Wishful, I just couldn't resist it), so I went to a different AI and it confirmed exactly what you said. So thanks for challenging me on this issue...its why Ive joined here (only yesterday, so still learning the ropes)

I do have theories about other sources of Shellac, but I wont go into it here. It was just because my symptoms with the nail varnish were so similar to the pills but more severe, that I mistakenly made the wrong link. I think that you're correct to suggest we just stick to the theory that Shellac could be the culprit in these pill coatings, whilst remaining open to he idea that other ingredients may be involved
 

Dysfunkion

Senior Member
Messages
539
I find specific sugars tend to make things much worse, I had to at one point replace my methyl-b12 because when I crashed I couldn't handle them anymore until I switched to the rice flour only version. I also started reacting the same way to anything with veggie glycerin in it. If I have something with a lot of standard granulated sugar I will get hit but interestingly like mentioned above it'll hit the hardest on day 2 after consuming. Usually with the standard increase in fatigue, head pressure, brain fog, speech issues, dysregulated immune system, ect-. Ironically the sugar substitutes are even worse, like instant horrible reaction worse. The worst one of them all is stevia. Anything that can be involved in glucose related pathways specifically in bacteria also trigger pretty wild reactions. I remember over the summer trying both glucuronolactone and glucosamine, probably 2 of the worst things I ever tried. If I for example eat a lot of carbs alone plain this doesn't tend to do much, like for example plain basmati or brown rice (the least offensive food to my body). I can eat an entire plate and there will barely any reaction. But specific glutamate byproducts like in processed soy products for example give me a terrible reaction yet soy itself like edamame doesn't do anything in any amount consumed.

When I first started getting sick (way back, last year of high school when I first started getting the beginning of my worst digestive problems before much else save for some fluctuating cognitive dysfunction) what triggered the point where I had to start supplementing things in general to stay alive was an episode of bad food poisoning from some meat cooked on a dirty grill, after that it was all downhill from there and that was also when I became intolerant of all mammal and bird meat. So I think I was just prone to this happening, as I got older those vulnerabilities got worse and my body couldn't keep up, and then after one bad trigger the real nightmare began through some gut bacteria/immune loop with possible autoimmune complications. There was also a mold component that got much worse later which when my old house got really bad also started affecting my digestive system in itself. My diet back then wasn't different than any other kid nor was it throughout my life. In fact if anything I ate healthier often and was more often concerned with staying skinny (and now I can barely keep the weight on no matter what I eat, the irony).

My current theory based on the millions of things I tried and dietary factors I've played with seem to point to my body not being able to handle something normal bacteria simply produce plus gut dysbiosis from food poisoning fluctuations in there like the one that really began the struggle. And feeding much of anything they can use in the specific glucose/glutamate related energy metabolism pathways creates a big mess. I slam them with certain herbals (currently propolis + cistus + myrrh *I also drink a lot of coffee) plus possible byproduct break down enzymes and this appears to keep me afloat. I'm still like always constantly trying new things and brain storming but so far after 2 years of really going at this, this is the only thing really breaking ground.
 

Rufous McKinney

Senior Member
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14,041
@Wishful I've fully taken on board your comments about the Shellac in varnishes, suggesting my theory is a bit flaky and lacks polish lol
May I also laugh, as this is a very funny sentence. When I think of varnish, I think flaky (eventually)

I do have theories about other sources of Shellac,
I thought Shellac was from tree sap. Instead its from the bugs Sucking Out the tree sap. And it contains these items, I just read:

it is mainly composed of aleuritic acid, jalaric acid, shellolic acid, and other natural waxes.

This came up around here before someplace. @Hip coated a capsule with shellac, to delay release in the gut


Meanwhile I'll have to investigate further, Lacs (a bug, in trees in Thailand). Because I already met Lerps (a bug, in eucalyptus from Australia (both the trees, and the bug, got exported)
 
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@Dysfunkion thanks so much for your interesting reply and glad to hear you're making some progress with your remedies. It sounds like you have a terrible time with your stomach...Ive had a quick look through your blog entries and didn't find any mention of Helicobacter pylori . I had similar problems when I was younger so can empathise. Have you been tested for this...just an idea as its such a common problem.

Anyway, onto the pill coatings and your sugar issues. I was actually talking about the enteric coatings in many 'gentle on the stomach' medications, not actual sugar itself and am now a bit worried if Ive not made that clear enough in my title...sadly I cannot edit the title so hopefully people will see the mention of Shellac (my suspected culprit in my symptoms) further down my post.

But I do hear what your saying about sugar generally. Im also a sugar fanatic and use it in quantities every day, and like you struggled with all white sugars, before eventually settling on raw brown granulated sugar which has been great. And again with artificial sweetners, I had so many bad experiences so quickly gave them up,

Anyhow, are you using any enteric coated medications at present? Perhaps generic painkillers like Paracetemol or Ibruprofen, or over the counter vitamins which dont even mention enteric coatings till you get home and find they are hard and shiny. The last 5 out of 6 boxes of such supermarket generic painkillers I bought in the last couple of years(UK) were enteric coated due to a lack of good labelling. Ive switched to capsules for pain management and now have no problems whatsoever. No ME flares for a few years now, since stopping these kind of enteric coated pills.

After your very bad reaction to glucuronolactone and glucosamine, can you remember or can you find out if they were enteric coated pills, a bit hard and shiny? It would be really useful for my research to find out. Also, could you let me know if your taking any enteric coated pills? Again, it would be very useful to know.

Anyway, thanks again for your considered response which is very useful. If you cant find out about those pills I'll ask my AI to do some research on it for you. Its been good to meet you and I hope to hear from you again before too long. Best wishes for a better week ahead.
 

Wishful

Senior Member
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6,338
Location
Alberta
Do you use sugar coated tablets yourself?
I rarely take pills, but yes, some of they have been coated, but caused no problems for me.

Figuring out what the causative component is is tricky. There may be obvious connections that prove wrong, and some other ingredient that isn't listed. As Rufous revealed, shellac is composed of various components, any of which could be the culprit for someone who was intolerant of shellac. There could be two people who are intolerant of two different components.

If you have an arts school, woodworking studio, or other such place conveniently near, you could ask whether they have shellac flakes, to save buying a whole box just to test one flake.

FWIW, I've done French polishing, which involves rubbing shellac (dissolved in alcohol) onto a surface. I didn't bother with gloves, so my fingers got coated with shellac several times a day. No symptoms from that.

Since you had the same response from nail polish and pills, consider the colouring agent. Maybe the pills and the nail polish contain red dye #whatever. The solvents in the polish might carry the dye into the bloodstream.

The obsious common component of nail polish and floor varnish would be a solvent. Those can cause symptoms that might mimic some ME symptoms without sharing the ME mechanism.
 
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May I also laugh, as this is a very funny sentence. When I think of varnish, I think flaky (eventually)


I thought Shellac was from tree sap. Instead its from the bugs Sucking Out the tree sap. And it contains these items, I just read:

it is mainly composed of aleuritic acid, jalaric acid, shellolic acid, and other natural waxes.

This came up around here before someplace. @Hip coated a capsule with shellac, to delay release in the gut


Meanwhile I'll have to investigate further, Lacs (a bug, in trees in Thailand). Because I already met Lerps (a bug, in eucalyptus from Australia (both the trees, and the bug, got exported)

May I also laugh, as this is a very funny sentence. When I think of varnish, I think flaky (eventually)


I thought Shellac was from tree sap. Instead its from the bugs Sucking Out the tree sap. And it contains these items, I just read:

it is mainly composed of aleuritic acid, jalaric acid, shellolic acid, and other natural waxes.

This came up around here before someplace. @Hip coated a capsule with shellac, to delay release in the gut


Meanwhile I'll have to investigate further, Lacs (a bug, in trees in Thailand). Because I already met Lerps (a bug, in eucalyptus from Australia (both the trees, and the bug, got exported)

Thank you so much for your reply Rufous and glad to have made you laugh. Thanks also for the link which I've yet to check out about the Shellac. I'm getting some very useful advice from @Wishful suggesting that there might be other factors at work in these coatings...The Shellac was the best I could come up with, and thought it linked to the varnishes , but now another potential culprit has been suggested. I looked at your page and saw you use mainly Chinese herbs with some success. Can you tell me if you use any enteric coated tablets in your regime, perhaps analgesics or similar. It would be useful to know. Anyhow, its nice to meet you here, and thanks again for your input. Enjoy your weekend
 
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I rarely take pills, but yes, some of they have been coated, but caused no problems for me.

Figuring out what the causative component is is tricky. There may be obvious connections that prove wrong, and some other ingredient that isn't listed. As Rufous revealed, shellac is composed of various components, any of which could be the culprit for someone who was intolerant of shellac. There could be two people who are intolerant of two different components.

If you have an arts school, woodworking studio, or other such place conveniently near, you could ask whether they have shellac flakes, to save buying a whole box just to test one flake.

FWIW, I've done French polishing, which involves rubbing shellac (dissolved in alcohol) onto a surface. I didn't bother with gloves, so my fingers got coated with shellac several times a day. No symptoms from that.

Since you had the same response from nail polish and pills, consider the colouring agent. Maybe the pills and the nail polish contain red dye #whatever. The solvents in the polish might carry the dye into the bloodstream.

The obsious common component of nail polish and floor varnish would be a solvent. Those can cause symptoms that might mimic some ME symptoms without sharing the ME mechanism.
I've got to dash right now @Wishful but I'm intrigued by your new theory. I'll get back to you as soon as Im able to discuss further. Thank you so much for your input and suggestions. Enjoy your evening
 

Rufous McKinney

Senior Member
Messages
14,041
Can you tell me if you use any enteric coated tablets in your regime, perhaps analgesics or similar. It would be useful to know. Anyhow, its nice to meet you here, and thanks again for your input. Enjoy your weekend
thank you!

I do not currently take anything enteric coated. I wish the BP pill was coated, it tastes horrible and pills often lodge in my throat.

In the past, I recall trying colostrum and having. the capsules appear, undigested, at the other end. This may be due to the too rapid transit time my digestion tends towards IBS-D although I've improved that quite a bit and "D" isn't frankly what is going on.
 

Dysfunkion

Senior Member
Messages
539
@Dysfunkion thanks so much for your interesting reply and glad to hear you're making some progress with your remedies. It sounds like you have a terrible time with your stomach...Ive had a quick look through your blog entries and didn't find any mention of Helicobacter pylori . I had similar problems when I was younger so can empathise. Have you been tested for this...just an idea as its such a common problem.

Anyway, onto the pill coatings and your sugar issues. I was actually talking about the enteric coatings in many 'gentle on the stomach' medications, not actual sugar itself and am now a bit worried if Ive not made that clear enough in my title...sadly I cannot edit the title so hopefully people will see the mention of Shellac (my suspected culprit in my symptoms) further down my post.

But I do hear what your saying about sugar generally. Im also a sugar fanatic and use it in quantities every day, and like you struggled with all white sugars, before eventually settling on raw brown granulated sugar which has been great. And again with artificial sweetners, I had so many bad experiences so quickly gave them up,

Anyhow, are you using any enteric coated medications at present? Perhaps generic painkillers like Paracetemol or Ibruprofen, or over the counter vitamins which dont even mention enteric coatings till you get home and find they are hard and shiny. The last 5 out of 6 boxes of such supermarket generic painkillers I bought in the last couple of years(UK) were enteric coated due to a lack of good labelling. Ive switched to capsules for pain management and now have no problems whatsoever. No ME flares for a few years now, since stopping these kind of enteric coated pills.

After your very bad reaction to glucuronolactone and glucosamine, can you remember or can you find out if they were enteric coated pills, a bit hard and shiny? It would be really useful for my research to find out. Also, could you let me know if your taking any enteric coated pills? Again, it would be very useful to know.

Anyway, thanks again for your considered response which is very useful. If you cant find out about those pills I'll ask my AI to do some research on it for you. Its been good to meet you and I hope to hear from you again before too long. Best wishes for a better week ahead.

Those entries are so old, I haven't updated that on this site in quite a while and just been posting my updates wherever they fit live on this site. I saw the mention of shellac, I haven't been exposed to that specifically so I don't know what my reaction to it would be.

I never use brown sugar myself but I'd imagine my reaction to that would be about the same as your ordinary table sugar. I was never big on sugar in general as much as inhaling carbs later became a stress management thing with me. My cravings tend to be for meaty, fatty, and salty.

I actually am using one enteric coated supplement, the serrapeptase but only because you need the enteric coating for it to survive the stomach acid to get into the small intestine. I haven't had any reaction to the enteric coating itself though. The rest of my supplements are capsules mostly with only rice flour at most though the myrrh I'm taking right now and papain contains magnesium stearate as a filler but I don't think I'm reacting to that at all either (like the rice flour or single ingredient supplements they are all in clear veggie capsules). I actually avoid hard shiney solid pills because of all the fillers and other ingredients those tend to have. I have some low dose aspirin sitting around but I never got around to seeing how I'd react to that, all through my life those generic pain pills never did anything for me anyways so I never buy them in general.

The glucaronolactone and glucosamine were just in clear capsules, no enteric coating or hard/shiney solid capsules. No problem I don't mind taking the time to type out everything I'm up to here. Some of the things I'm doing in combinations I'm using them in no one here or anywhere else has before so anything I log here is more data for people of the future to look into.
 

Rufous McKinney

Senior Member
Messages
14,041
the serrapeptase but only because you need the enteric coating for it to survive the stomach acid to get into the small intestine.
I mostly take nattoK, now and then.

It was news to me this serrapetase is in a delayed release capsule. Wow: see label.

I need to actually take some.

Anything which "suggests" I should take it on an empty stomach or in between meals, well, I end up hardly ever taking any such things.
 

Dysfunkion

Senior Member
Messages
539
I mostly take nattoK, now and then.

It was news to me this serrapetase is in a delayed release capsule. Wow: see label.

I need to actually take some.

Anything which "suggests" I should take it on an empty stomach or in between meals, well, I end up hardly ever taking any such things.

I usually take it after my coffee in the morning (but its black so no milk weight to that or anything). A little breakfast 15-20 minutes before. Not perfect but it still works. I could imagine some people don't do well on the "empty stomach required" pills that pass stomach acid but these don't bother it surprisingly.
 

Wishful

Senior Member
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6,338
Location
Alberta
One reason why shellac is unlikely to the the component you're intolerant to is that it's not water-soluble, and probably not fat-soluble either. That doesn't make intolerance impossible, just less likely.

Just for interest: shellac gradually converts into polyester molecules. I think that takes many years, so not an issue with pills if you follow the best-before date. I think it does mean that polyester micro/nanoparticles in humans isn't a new thing.
 

Dysfunkion

Senior Member
Messages
539
One reason why shellac is unlikely to the the component you're intolerant to is that it's not water-soluble, and probably not fat-soluble either. That doesn't make intolerance impossible, just less likely.

Just for interest: shellac gradually converts into polyester molecules. I think that takes many years, so not an issue with pills if you follow the best-before date. I think it does mean that polyester micro/nanoparticles in humans isn't a new thing.
I have known someone before with an allergy to polyester so thats also a thing though im not sure if those can go airborne. I'm not sure what I react to in cleaning products myself but mine start with inhalation of the fumes of many them. You'd probably never be able to specifically tell what is doing it though because so many of them have so many ingredients.
 
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@Wishful Thanks again for your recent comments and insights about Shellac and other possible culprits. It sounds like you could be right about the shellac and that Im simply barking up the wrong tree lol. The thing of it is, because there are several components to these coatings, and worse still, that these components vary from pill to pill, theres no real way of separating them.

I just looked again at my shop bought analgesics that have done for me in the past, and some had as many as 7 components. All I know is, something in these coatings puts me on the floor while uncoated or capsule varieties are perfectly agreeable, and that for the time being Im just going to continue to avoid them entirely and remain symptom free.

I was interested to hear about the shellac polyester issue, as im dreadfully sensitive to polyester and cant have it near my skin at all. Having said that, with a bad case of COPD and asthma Im allergic and sensitive to many things. Talking of which, you were right about my allergy to red dye...if I eat annatto in red cheese, I end up with a blinding headache, so always give it a wide bearth. I need to give the new list I made up last night of the different ingredients of the coatings to my AI, and see what else they think might be the issuse if its not the shellac.

Ive had to forgive my AI the glaring mistake of saying Shellac was in all nail varnish, after typing in 'nail varnish' into my browser and it came up with pages of this 'Shellac' brand of nail varnish, totally confusing the AI...it just goes to show, that with really important stuff like this, that you have to check the AIs results for mistakes or flaws. It was certainly a valuable lesson for me as someone who has recently been using AI a lot for research purposes.

I also might buy some shellac flakes to test although eating it in pill form over several days, might get a different result from dipping fingers into it, but could be worth a try. I just have to be so careful of potential allergens lest I end up gasping for air or near choking to death.

Anyway, thanks again for your valuable input Wishful and hoping your having a fine week where you are.
 

Wishful

Senior Member
Messages
6,338
Location
Alberta
I think it must be one or the other?
No, shellac is soluble in alcohols. Some things are soluble in ketones, but not water or fats. Plenty of things that dissolve only in certain solvents.

My old chainsaw stopped working recently. The little "rubber" tube in the fuel tank had turned into goo. The material was probably insoluble in hydrocarbons, but today's gasoline has 10% alcohol, which the tube didn't need to be proof against before. Likewise, epoxy used to be suitable for sealing gas tank leaks, but with alcohol it turns to goo.

Regarding listed ingredients, are manufacturers required to list all possible contaminants? I'm imagining a pill moving down a conveyor belt and brushing against a part that had lubrication on it, or cleaning fluid. Just sliding down a plastic chute might rub some polymer or additive molecules onto the pill. Sure it's just trace amounts, but some people might be sensitive to even trace amounts. I wonder whether anyone has reactions to the plastic(s) in typical pill bottles.
 
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