Betaine Invalid Link Removed for one, but if one were so inclined searching the internet using the terms "human studies" with the supplement usually turn some up if there is any.
I'll add Choline (thinking off the top of my head CDP and Citrate), Huperzine A, ArA, LCLT, Green Coffee Bean Extract (up for debate on the parameters of the test I suppose), plenty others I'm missing.
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