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Several promising studies in animal models demonstrated a marked improvement in cognition

PubMed, Eggers, Erika D., and Peter D

tl;dr More medical studies are needed, but up to 2 grams a day seems safe for most people

Postiglione A, Soricelli A, Cicerano U, et al

Consideration of the possible sex disparity and exploration of the underlying pathways would be worthwhile

[DOI] [PubMed] [Google Scholar] 108.Ye Y.X., Chen H.G., Sun B., Chen Y.J., Duan P., Meng T.Q., Xiong C.L., Wang Y.X., Pan A