Others find benefit from Branched-Chain Amino Acids (BCAAs), which are naturally found in protein.
@Pyrrhus - You're right, BCAAs are found in protein. However, if one is deficient in BCAAs, just eating more protein may not be enough. I've eaten lots of protein for many years, but still had a leucine deficiency. I read that a leucine deficiency is unusual, but there it was - I think ME/CFS depletes amino acids in many people , being used for fuel. I've read this is especially true for women who have ME/CFS. When I started taking BCAAs almost 7 years ago, they cut my PEM recovery time by more than half. I couldn't have eaten enough protein to have this effect. And then when I briefly tried a keto diet, my BCAAs very quickly got depleted - started crashing easier, crashes lasted longer. I think my body started devouring my amino acids in place of the carbs it was no longer getting. This illness is diabolical!
So taking BCAAs might help
@Nadirtopinnacle . 4000 - 5000 mg a day (in 2 divided doses) works for me, some take more. they can also help with energy. And I have to keep taking them - I can't stop or else I backslide very quickly.
Lecithin noticeably improved my memory, and it's done the same for a few other people I know.
@Pyrrhus , this is interesting - I didn't know this:
Unfortunately, many people have temporary start-up effects when they try choline. Since choline synthesis in the body consumes a large percentage of the body's methyl donors, taking supplemental choline should free up a large percentage of the body's methylation capacity, perhaps more than 50%. Therefore, choline supplements can come with the same negative start-up effects as other supplements that boost the body's methylation capacity.
If one had negative methylation start-up effects after taking a choline supplement, perhaps some niacin could help? Anyways this is good to know!
Many people's cognitive functioning is helped by B12 as is
@Hip 's, so I think it's definitely worth a try. My doctor (who unfortunately died several years ago) had me taking B12 for many years prior to ME/CFS onset. I wonder sometimes if this is why I've been spared the brain fog which hits so many.
One last suggestion is gotu kola. It has the paradoxical effects of boosting cognitive function and blood flow to the brain, while at the same time reducing anxiety and stress. I tried it at night and to my surprise it did help with sleep.
Gotu Kola: 10 Benefits, Side Effects, and More (healthline.com)