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Several species of plants have been selected for testing as nootropic agents because of their use in traditional medicine, and research has already identified several promising natural substances that could act as cognitive enhancers (Table 1) [3,165,166]
doi: 10.4161/gmic.19320 97 WuJ.YangK.FanH.WeiM.XiongQ

For microdosing, lower concentrations are almost always better

10.1074/jbc.272.25.16010 CrossRef Google Scholar View reference in article 115 WangL.WangN.ZhangW.ChengX.YanZ.ShaoG.et al (2022)

Aluminum, copper, iron and zinc differentially alter amyloid-A (142) aggregation and toxicity
