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The answer is L serine 
for those that don’t click…
" a recent study found that the dietary supplement L-serine, an essential compound that influences brain functionality, may cause a cognitive decline in some adults."
“The supplement has been seen to have a therapeutic effect on epilepsy, schizophrenia, and psychosis.”
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I take 1500mg L-serine daily these days. It seems to help me sleep. It may help some people and cause decline in others. I guess it depends on which study one looks at. I think that it causes decline is contrary to most studies. Just more evidence that we are all different and not the same works for everyone.
L-serine is thought to be why people live so long in Japan. It’s found in seafood which the Japanese eat a lot out of.
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