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Loren Pickart in 1973, the GHK-Cu copper peptide was isolated based on observations that plasma from younger individuals contained factors that influenced liver cell behavior differently than plasma from older individuals
10.1055/s-0042-1755274 52 WangC.LiH.ShengL.Bao-zhiC.Jin-yingW.Jian-guangC.et al (2014a)
DZN administered at 4.1 mg/kg to mice for 4 weeks increased testosterone levels, but it reduced testosterone levels when administered at 8.2 mg/kg [13]
doi: 10.2174/138161205774913255 53
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