This is good. If anyone wants to do a follow-up I’d like to see a higher dosage used, and I’d like to see the effect of weekly supplementation, eg each week you fill your pill-box either with vit-d or l-theanine and rate the week as a whole (with some blinding process). Finally interested in populations with high caffeine use.
If I had billg money, I’d divert some of it into just running high quality tests of all these “maybe” supplements.
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