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Reputable manufacturers submit their products to independent laboratories that verify the supplement contains what the label claims and is free from contaminants such as heavy metals, pesticides, and microbial contamination

doi: 10.1016/j.cub.2018.05.094 69 DongHQiangZChaiDPengJXiaYHuRet al

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10.1002/jcp.30040 35 DingM.FengN.TangD.FengJ.LiZ.JiaM.et al (2018)

A cross-sectional study of 2,900 Australian men and women, 49 years of age and older, found that those in the highest quintile of riboflavin intake were 50% less likely to have cataracts than those in the lowest quintile (35)

While both are copper peptides, AHK-Cu has a distinct amino acid sequence from GHK-Cu, meaning their exact biological activities and pharmacokinetics may differ