Freddd
Senior Member
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- 5,184
- Location
- Salt Lake City
I want to start off here by thanking Rich VK, once again, for being very correct on his CblC disease suspicion about me, despite the research that verifies it not being published in many cases before he put the understanding together. And much more important, the PARTIAL METHYLATION, understanding. The partial methylation is much more “hard edged” than I think that Rich recognized. Partial methylation acts the way it does because of the “internal triage levels” as earlier researchers called it, that allows partial methylation, effective on some levels at the same time as having deficiency symptoms on other levels. And these levels or compartments are not what are expected so they all look like they don’t go with each other.
Using these understandings makes understanding what those weird problems with teeth and gums may originate from and that all those responses on the 3rd day or so following MeCbl/Mfolate startup that are not neurological brightening, to be “refeeding syndrome”. People wanted answers. Unfortunately for me, all the answers I’ve had have been gotten the hard way; CblC disease – adult onset, low potassium, copper deficiency, neurological damage, multi organ breakdown (kidney disease, heart muscle damage, from excess MMA (low AdoCbl/L-carnitine fumarate) and/or high HCY damge,heart disease, strokes, etc
For years I have talked about “startup” symptoms, because of the time of occurrence in relation to starting any of several supplements. Just which “startup” symptoms and what caused them was the subject of much speculation, trials, disagreements about hypotheses and so on. The last 5 years I have had the return of some symptoms in a different way and mix and severities than ever before and my gums were melting away and the dentist couldn’t stop it or even know why. I had to have all my uppers pulled and complete upper dentures now. I have been on the copper for almost 3 months now. When I started copper, it was apparent that it was perceived as working in hours. The sleep disorders were gone in 2 days. The perception of the demyelinations slowed to a stop in 3 days. On the third day my need for potassium increased noticeably by 400mg. Perceived recovery has been slow on the leg muscle strength. After 2-3 months the dentist can see a visible difference in my lower gums which with a lot of luck, might stop getting worse or even recover a little allowing me to keep my teeth.
I have heard this kind of question about teeth and gums a few times and never had an answer. Associated questions were lots of reoccurring tooth root cavities on the roots exposed by the gums melting away without gum infections. Associated with this can be sleep disorders and subacute combined degeneration type lesions causing problems relatively frequently occurring in the upper motor neurons and causes more perceived weakness than MeCbl/Mfolate caused lesions.
The copper deficiency symptoms were clear enough that my doctor agreed and ordered tests. Like so much else, my copper was at the low end of “in range” but I had rapidly worsening symptoms. Two days after seeing the doctor, before the results could be back, she called me to see how I was doing and I told her I started on the copper the previous day without waiting for results as I felt so bad, and it was already having a noticeable effect and gave the details on the copper I was using, the Solgar Copper amino acid chelate, which was used in UK case studies collection where there was no pharmacological copper supplement available.
In 1945 a new "syndrome" was named. "refeeding syndrome" after people who were starving started dropping dead from starting eating again. It turned out to happen typically about the third day after starting eating again. In the decades following, it was found that “refeeding syndrome” could occur from anorexia, 5 days of fasting or food deprivation, and even very specifically, specific vitamin and nutrient deficiencies whose lack causes lack of cell making. CyCbl was discovered to cause Hypokalemia on the third day following injection as cell formation (red blood cells assumed) progressed. Hypokalemia, low potassium, on the third day after starting the deficient nutrients, became the tip-off of “refeeding syndrome”. Basically almost any minerals needed could become deficient and be an induced deficiency. So copper is also a common induced deficiency but comes on far more slowly than potassium. Also, copper deficiency does damage over time rather than a person dropping dead quickly so it isn’t noticed the same way. In the CblC disease, a genetic form causing B12 and folate deficiencies, the disease is specified as having “unstable electrolytes”, like potassium, magnesium, calcium, copper, manganese and so forth. Whether that is an induced set of deficiencies from refeeding syndrome and hence inherent in treating CblC disease or inherent in CblC disease itself is undetermined. Further CblC disease has “low cellular folate” as a characteristic. Whether that is inherent in CblC disease or is there as part of methyltrap caused by treating it, again isn’t known. What a person can be sure of is a succession of induced deficiencies. Potassium and folate deficiencies are present almost always in refeeding syndrome and attempted recovery from CblC disease.
Many nutrients of which people can become specifically deficient can cause refeeding syndrome. It can be everything in general, i.e. caloric and multi nutrient deficiencies, or a single specific nutrient such as folate or B12. ANY vitamin or mineral or essential amino acid can become deficient and cause refeeding syndrome. However, only a few tend to at any given time. Instead what appears is that the main set of symptoms is those of the item that is most deficient, where the majority of “fails” to complete reaction occur.
If one looks at the lists of deficiency symptoms they have changed over time as knowledge changes over time. If one looks at the list of B12/folate responsive symptoms list let’s look at the people that respond with those symptoms in those patterns, and how those patterns change.
So what happens if somebody takes vitamins that have no effect? NOTHING! What happens if somebody takes vitamins and on the approximate 3rd day after starting they get all sorts of worsening symptoms, feeling maybe really sick, is likely “refeeding syndrome”. The two 3-4 day supplements that go low with intense symptoms are potassium and low l-methylfolate.
REFEEDING SYNDROME INDUCED DEFICIENCIES
Version 1.21 04/11/2015
Group 1 – Hypokalemia onset. Symptoms may appear with serum potassium as high as 4.3. May become dangerous if ignored. Considered “rare” with CyCbl (cyanocobalamin) it is very common with MeCbl (methylcobalamin) and AdoCbl (adenosylcobalamin) and less so with HyCbl (hydroxycobalamin).
There does not appear to be a clear order of onset. The order of onset varies widely from person to person but many appear consistent for each episode for any given person. There tend to be more and more intense symptoms as it gets worse. Some people have ended up in the ER because of not recognizing the symptoms.
IBS – Steady constipation, Nausea, Vomiting, Paralyzed Ileum,
Hard knots of muscle, Sudden muscle spasms when relaxed, Sudden muscle spasms when stretching , Sudden muscle spasms when kneeling, Sudden muscle spasms when reaching , Sudden muscle spasms when turning upper body to side, Tightening of muscles, spasms and excruciating pain in neck muscles, waking up screaming in pain from muscle spasms in legs. Muscle weakness
Abnormal heart rhythms (dysrhythmias), increased pulse rate, increased blood pressure
Emotional changes and/or instability, dermal or sub-dermal Itching, and if not treated potentially paralysis and death.
Group 2a - Both
IBS – Diarrhea alternating with constipation, IBS – Normal alternating with constipation
Group 2b – Either or both
Headache, Increased malaise, Fatigue
Group 3 - Induced and/or Paradoxical Folate deficiency or insufficiency
These symptoms appear in 2 forms generally, the milder symptoms that start with partial methylation block and the more severe symptoms that come on as partial methylation block gets worse or very quickly with methyltrap onset.
Edema - An additional thing I would like to mention. I would never have found it without 5 years of watching the onset of paradoxical folate insufficiency and trying to catch it earlier and earlier and to figure out what was causing it and to reverse it. For me the onset order goes back to the day of onset now with edema and a sudden increase of weight. I noticed that within 2 hours of taking sufficient Metafolin I would have an increase in urine output.
Old symptoms returning
Angular Cheilitis, Canker sores,
Skin rashes, acne like lesions potentially over whole body and potentially growing to the size of a 50 cent piece., Skin peeling around fingernails, Skin cracking and peeling at fingertips,
Increased hypersensitive responses, Runny nose, Increased allergies, Increased Multiple Chemical Sensitivities, Increased asthma, rapidly increasing Generalized inflammation in body, Increased Inflammation pain in muscles, Increased Inflammation pain in joints, Achy muscles, Flu like symptoms
IBS – Steady diarrhea, IBS – Diarrhea alternating with normal, Stomach ache, Uneasy digestive tract,
Coated tongue, Depression, Less sociable, Impaired planning and logic, Brain fog, Low energy, Light headedness, Sluggishness, Increase irritability, Heart palpitations,.
Longer term, very serious
Loss of reflexes, Fevers, Forgetfulness, Confusion, Difficulty walking, Behavioral disorders, Dementia, Reduced sense of taste, bleeding easily
Group 4 - Hydroxycbl onset, degraded methylcbl onset, methylcbl after photolytic breakdown onset.
Itchy bumps generally on scalp or face that develops to acne like lesions in a few days from start.
Group 3 symptoms, induced paradoxical folate deficiency or insufficiency are corrected quickly with titrated doses of Metafolin, methylb12 and adenosylb12. If glutathione (precursors) are the cause then larger doses of Metafolin, 7.5-15mg,or maybe more are needed. Different tissues are affected at different levels of methylfolate, it comes or goes in stages. Very strong dose proportionate characteristics are present. Serum folate levels may be high or even very high despite Metafolin responsive deficiency/insufficiency symptoms.
Group 1 symptoms respond readily to potassium. The symptoms and response to potassium may occur at a serum level of 4.3 or less.
With l-methylfolate only available for a bit more than a decade we don’t have a lot of information. So we look at the symptom. With people with those symptoms, a person receiving MeCbl, about 75% will have obvious symptoms changes in hours to days.
With partial methylation block one has a mix of MeCbl, AdoCbl and folate deficiency symptoms immediately. When one had severe MeCbl/AdoCbl deficiency symptoms, methyltrap occurs. Instead of B12 deficiency symptoms one has awful folate deficiency symptoms. That is because methyltrap causes the expulsion of methylfolate from the cell causing the biochemical fail at FOLATE and hence folate deficiency symptoms. Give the person a little b12 and suddenly the folate symptoms go away and the b12 deficiencies symptoms get far worse. Increase B1, B2, B3 or inositol above a certain level and folate deficiency symptoms get far worse rapidly increasing the need for more folate and more potassium. Add too much P5P and the hematocrit goes up too much causing a thicker blood. The same results as too much testosterone causes. However, the hematocrit goes down with less P5P even while testosterone remains the same. It is said that lack of methylation causes low testosterone. However, low copper causes non-methylation as does lack of MeCbl/mfolate and causes a drop of testosterone level. In my experience, after manifesting copper deficiency symptoms (subacute combined degeneration type) I I increased copper and suddenly my testosterone level increased dramatically, 300ng/L. Copper deficiency causes “sub acute combined degeneration” type lesions that are not exactly the same as low folate/B12. They take longer to heal and they cause more damage to the upper motor neurons causing more perceived weakness in the legs and arms. The copper lack also causes breakdown of connective tissue including spider veins, varicose veins, connective tissue breakdown, gum tissue breakdown and any number of problems not generally caused by lack of methylation. The copper deficiency is most distinguishable from methylation deficiency after the methylation is taken care of adequately, otherwise it is indistinguishable.
So in refeeding syndrome one does not have a simple single deficiency but rather a sequence of deficiencies that can go on for months or even years. I’m 12 years into healing and I was almost done when clobbered by glutathione (“catastrophic b12 deficiency” when a person has CblC disease). In recovering from that I got worse as the copper deficiency started up. I am in a process of going through all the micro mineral nutrients as those were specifically mentioned as being commonly induced deficiencies and unrecognized in refeeding syndrome.
And the number one most common and recognizable nearly immediately is potassium. Low folate (high histamine and inflammation symptoms, epithelial tissue breakdown and so forth, see the lists above) is the other very common and recognizable.
Interestingly, with the copper supplementation, my testosterone went up by 300ng/L in 6 weeks. My kidney function is the best it has been in 30 years. The copper has made a huge difference for me. Part of the problem is that the copper serum level was 74 (72 is bottom of range), still “in range” but not by much. And I was having neurological deterioration, sleep problems, fatigue problems and all that coming on very quickly. It was worsening noticeably by the day. My doc agreed that copper appeared likely and I tried copper. The difference was clear in less than 12 hours. The neurological deterioration stopped just like that, in hours.
So in an example of low speed starvation such as CFS/FMS with a whole lot of smaller miscellaneous deficiencies we might see an order of deficiencies such as the following. These are assuming that most of the basics have been taken care of in the basics otherwise everything becomes deficient along the way. It should come to nobody’s surprise how complicated this all looks.
1. MeCbl
2. Potassium
3. L-methylfolate
4. Potassium
5. AdoCbl
6. Potassium
7. L-carnitine fumarate
8. Potassium
9. SAM-e
10. Potassium
11. Zinc
12. Potassium
13. L-methylfolate
14. Potassium
15. Copper
16. Potassium
17. L-methylfolate
18. Potassium
19. Manganese
20. Biotin
21. Potassium
22. Etc.
One of the big problems is that often the only item that will respond immediately is that which is most deficient, that which is stopping the reactions right now. So often items have to be tested a number of times because they are not stopping the reaction, until it is.
Some people also just can’t metabolize LCF but rather must have ALCAR. 90% may require only LCF but 10% equally strongly require ALCAR. Another problem is MeCbl. The problem of MeCbl is that it isn’t a single simple thing. There is an unknown number of MeCbl variations; whether isomers, stereo isomers, bacterial and/or processing differences of MeCbl variations and only one or two versions are outright excellent and nobody knows which ones they are.
Using these understandings makes understanding what those weird problems with teeth and gums may originate from and that all those responses on the 3rd day or so following MeCbl/Mfolate startup that are not neurological brightening, to be “refeeding syndrome”. People wanted answers. Unfortunately for me, all the answers I’ve had have been gotten the hard way; CblC disease – adult onset, low potassium, copper deficiency, neurological damage, multi organ breakdown (kidney disease, heart muscle damage, from excess MMA (low AdoCbl/L-carnitine fumarate) and/or high HCY damge,heart disease, strokes, etc
For years I have talked about “startup” symptoms, because of the time of occurrence in relation to starting any of several supplements. Just which “startup” symptoms and what caused them was the subject of much speculation, trials, disagreements about hypotheses and so on. The last 5 years I have had the return of some symptoms in a different way and mix and severities than ever before and my gums were melting away and the dentist couldn’t stop it or even know why. I had to have all my uppers pulled and complete upper dentures now. I have been on the copper for almost 3 months now. When I started copper, it was apparent that it was perceived as working in hours. The sleep disorders were gone in 2 days. The perception of the demyelinations slowed to a stop in 3 days. On the third day my need for potassium increased noticeably by 400mg. Perceived recovery has been slow on the leg muscle strength. After 2-3 months the dentist can see a visible difference in my lower gums which with a lot of luck, might stop getting worse or even recover a little allowing me to keep my teeth.
I have heard this kind of question about teeth and gums a few times and never had an answer. Associated questions were lots of reoccurring tooth root cavities on the roots exposed by the gums melting away without gum infections. Associated with this can be sleep disorders and subacute combined degeneration type lesions causing problems relatively frequently occurring in the upper motor neurons and causes more perceived weakness than MeCbl/Mfolate caused lesions.
The copper deficiency symptoms were clear enough that my doctor agreed and ordered tests. Like so much else, my copper was at the low end of “in range” but I had rapidly worsening symptoms. Two days after seeing the doctor, before the results could be back, she called me to see how I was doing and I told her I started on the copper the previous day without waiting for results as I felt so bad, and it was already having a noticeable effect and gave the details on the copper I was using, the Solgar Copper amino acid chelate, which was used in UK case studies collection where there was no pharmacological copper supplement available.
In 1945 a new "syndrome" was named. "refeeding syndrome" after people who were starving started dropping dead from starting eating again. It turned out to happen typically about the third day after starting eating again. In the decades following, it was found that “refeeding syndrome” could occur from anorexia, 5 days of fasting or food deprivation, and even very specifically, specific vitamin and nutrient deficiencies whose lack causes lack of cell making. CyCbl was discovered to cause Hypokalemia on the third day following injection as cell formation (red blood cells assumed) progressed. Hypokalemia, low potassium, on the third day after starting the deficient nutrients, became the tip-off of “refeeding syndrome”. Basically almost any minerals needed could become deficient and be an induced deficiency. So copper is also a common induced deficiency but comes on far more slowly than potassium. Also, copper deficiency does damage over time rather than a person dropping dead quickly so it isn’t noticed the same way. In the CblC disease, a genetic form causing B12 and folate deficiencies, the disease is specified as having “unstable electrolytes”, like potassium, magnesium, calcium, copper, manganese and so forth. Whether that is an induced set of deficiencies from refeeding syndrome and hence inherent in treating CblC disease or inherent in CblC disease itself is undetermined. Further CblC disease has “low cellular folate” as a characteristic. Whether that is inherent in CblC disease or is there as part of methyltrap caused by treating it, again isn’t known. What a person can be sure of is a succession of induced deficiencies. Potassium and folate deficiencies are present almost always in refeeding syndrome and attempted recovery from CblC disease.
Many nutrients of which people can become specifically deficient can cause refeeding syndrome. It can be everything in general, i.e. caloric and multi nutrient deficiencies, or a single specific nutrient such as folate or B12. ANY vitamin or mineral or essential amino acid can become deficient and cause refeeding syndrome. However, only a few tend to at any given time. Instead what appears is that the main set of symptoms is those of the item that is most deficient, where the majority of “fails” to complete reaction occur.
If one looks at the lists of deficiency symptoms they have changed over time as knowledge changes over time. If one looks at the list of B12/folate responsive symptoms list let’s look at the people that respond with those symptoms in those patterns, and how those patterns change.
So what happens if somebody takes vitamins that have no effect? NOTHING! What happens if somebody takes vitamins and on the approximate 3rd day after starting they get all sorts of worsening symptoms, feeling maybe really sick, is likely “refeeding syndrome”. The two 3-4 day supplements that go low with intense symptoms are potassium and low l-methylfolate.
REFEEDING SYNDROME INDUCED DEFICIENCIES
Version 1.21 04/11/2015
Group 1 – Hypokalemia onset. Symptoms may appear with serum potassium as high as 4.3. May become dangerous if ignored. Considered “rare” with CyCbl (cyanocobalamin) it is very common with MeCbl (methylcobalamin) and AdoCbl (adenosylcobalamin) and less so with HyCbl (hydroxycobalamin).
There does not appear to be a clear order of onset. The order of onset varies widely from person to person but many appear consistent for each episode for any given person. There tend to be more and more intense symptoms as it gets worse. Some people have ended up in the ER because of not recognizing the symptoms.
IBS – Steady constipation, Nausea, Vomiting, Paralyzed Ileum,
Hard knots of muscle, Sudden muscle spasms when relaxed, Sudden muscle spasms when stretching , Sudden muscle spasms when kneeling, Sudden muscle spasms when reaching , Sudden muscle spasms when turning upper body to side, Tightening of muscles, spasms and excruciating pain in neck muscles, waking up screaming in pain from muscle spasms in legs. Muscle weakness
Abnormal heart rhythms (dysrhythmias), increased pulse rate, increased blood pressure
Emotional changes and/or instability, dermal or sub-dermal Itching, and if not treated potentially paralysis and death.
Group 2a - Both
IBS – Diarrhea alternating with constipation, IBS – Normal alternating with constipation
Group 2b – Either or both
Headache, Increased malaise, Fatigue
Group 3 - Induced and/or Paradoxical Folate deficiency or insufficiency
These symptoms appear in 2 forms generally, the milder symptoms that start with partial methylation block and the more severe symptoms that come on as partial methylation block gets worse or very quickly with methyltrap onset.
Edema - An additional thing I would like to mention. I would never have found it without 5 years of watching the onset of paradoxical folate insufficiency and trying to catch it earlier and earlier and to figure out what was causing it and to reverse it. For me the onset order goes back to the day of onset now with edema and a sudden increase of weight. I noticed that within 2 hours of taking sufficient Metafolin I would have an increase in urine output.
Old symptoms returning
Angular Cheilitis, Canker sores,
Skin rashes, acne like lesions potentially over whole body and potentially growing to the size of a 50 cent piece., Skin peeling around fingernails, Skin cracking and peeling at fingertips,
Increased hypersensitive responses, Runny nose, Increased allergies, Increased Multiple Chemical Sensitivities, Increased asthma, rapidly increasing Generalized inflammation in body, Increased Inflammation pain in muscles, Increased Inflammation pain in joints, Achy muscles, Flu like symptoms
IBS – Steady diarrhea, IBS – Diarrhea alternating with normal, Stomach ache, Uneasy digestive tract,
Coated tongue, Depression, Less sociable, Impaired planning and logic, Brain fog, Low energy, Light headedness, Sluggishness, Increase irritability, Heart palpitations,.
Longer term, very serious
Loss of reflexes, Fevers, Forgetfulness, Confusion, Difficulty walking, Behavioral disorders, Dementia, Reduced sense of taste, bleeding easily
Group 4 - Hydroxycbl onset, degraded methylcbl onset, methylcbl after photolytic breakdown onset.
Itchy bumps generally on scalp or face that develops to acne like lesions in a few days from start.
Group 3 symptoms, induced paradoxical folate deficiency or insufficiency are corrected quickly with titrated doses of Metafolin, methylb12 and adenosylb12. If glutathione (precursors) are the cause then larger doses of Metafolin, 7.5-15mg,or maybe more are needed. Different tissues are affected at different levels of methylfolate, it comes or goes in stages. Very strong dose proportionate characteristics are present. Serum folate levels may be high or even very high despite Metafolin responsive deficiency/insufficiency symptoms.
Group 1 symptoms respond readily to potassium. The symptoms and response to potassium may occur at a serum level of 4.3 or less.
With l-methylfolate only available for a bit more than a decade we don’t have a lot of information. So we look at the symptom. With people with those symptoms, a person receiving MeCbl, about 75% will have obvious symptoms changes in hours to days.
With partial methylation block one has a mix of MeCbl, AdoCbl and folate deficiency symptoms immediately. When one had severe MeCbl/AdoCbl deficiency symptoms, methyltrap occurs. Instead of B12 deficiency symptoms one has awful folate deficiency symptoms. That is because methyltrap causes the expulsion of methylfolate from the cell causing the biochemical fail at FOLATE and hence folate deficiency symptoms. Give the person a little b12 and suddenly the folate symptoms go away and the b12 deficiencies symptoms get far worse. Increase B1, B2, B3 or inositol above a certain level and folate deficiency symptoms get far worse rapidly increasing the need for more folate and more potassium. Add too much P5P and the hematocrit goes up too much causing a thicker blood. The same results as too much testosterone causes. However, the hematocrit goes down with less P5P even while testosterone remains the same. It is said that lack of methylation causes low testosterone. However, low copper causes non-methylation as does lack of MeCbl/mfolate and causes a drop of testosterone level. In my experience, after manifesting copper deficiency symptoms (subacute combined degeneration type) I I increased copper and suddenly my testosterone level increased dramatically, 300ng/L. Copper deficiency causes “sub acute combined degeneration” type lesions that are not exactly the same as low folate/B12. They take longer to heal and they cause more damage to the upper motor neurons causing more perceived weakness in the legs and arms. The copper lack also causes breakdown of connective tissue including spider veins, varicose veins, connective tissue breakdown, gum tissue breakdown and any number of problems not generally caused by lack of methylation. The copper deficiency is most distinguishable from methylation deficiency after the methylation is taken care of adequately, otherwise it is indistinguishable.
So in refeeding syndrome one does not have a simple single deficiency but rather a sequence of deficiencies that can go on for months or even years. I’m 12 years into healing and I was almost done when clobbered by glutathione (“catastrophic b12 deficiency” when a person has CblC disease). In recovering from that I got worse as the copper deficiency started up. I am in a process of going through all the micro mineral nutrients as those were specifically mentioned as being commonly induced deficiencies and unrecognized in refeeding syndrome.
And the number one most common and recognizable nearly immediately is potassium. Low folate (high histamine and inflammation symptoms, epithelial tissue breakdown and so forth, see the lists above) is the other very common and recognizable.
Interestingly, with the copper supplementation, my testosterone went up by 300ng/L in 6 weeks. My kidney function is the best it has been in 30 years. The copper has made a huge difference for me. Part of the problem is that the copper serum level was 74 (72 is bottom of range), still “in range” but not by much. And I was having neurological deterioration, sleep problems, fatigue problems and all that coming on very quickly. It was worsening noticeably by the day. My doc agreed that copper appeared likely and I tried copper. The difference was clear in less than 12 hours. The neurological deterioration stopped just like that, in hours.
So in an example of low speed starvation such as CFS/FMS with a whole lot of smaller miscellaneous deficiencies we might see an order of deficiencies such as the following. These are assuming that most of the basics have been taken care of in the basics otherwise everything becomes deficient along the way. It should come to nobody’s surprise how complicated this all looks.
1. MeCbl
2. Potassium
3. L-methylfolate
4. Potassium
5. AdoCbl
6. Potassium
7. L-carnitine fumarate
8. Potassium
9. SAM-e
10. Potassium
11. Zinc
12. Potassium
13. L-methylfolate
14. Potassium
15. Copper
16. Potassium
17. L-methylfolate
18. Potassium
19. Manganese
20. Biotin
21. Potassium
22. Etc.
One of the big problems is that often the only item that will respond immediately is that which is most deficient, that which is stopping the reactions right now. So often items have to be tested a number of times because they are not stopping the reaction, until it is.
Some people also just can’t metabolize LCF but rather must have ALCAR. 90% may require only LCF but 10% equally strongly require ALCAR. Another problem is MeCbl. The problem of MeCbl is that it isn’t a single simple thing. There is an unknown number of MeCbl variations; whether isomers, stereo isomers, bacterial and/or processing differences of MeCbl variations and only one or two versions are outright excellent and nobody knows which ones they are.