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GHK-Cu is naturally present in the human body, but levels decline with age

Eur J Endocrinol 162:10351042 Zhang Z, Li Q, He W, Qiu H, Ye H, Wang Y, Shen M, He M, Yu Y, Shou X, Huang C, Yu H, Huang G, Tang W, Geng D, Fu C, Liu C, Ma Z, Ye Z, Zhang Q, Zhang Y, Shen Y, Yang Y, Wang M, Liu X, Lu Y, Hu R, Mao Y, Zhou L, Li Y, Li S, Tritos NA, Zhao Y (2018) The comprehensive impact on human body induced by resolution of growth hormone excess

GHK-Cu Copper Complex Research Compound Discover GHK-Cu (Glycyl-L-Histidyl-L-Lysine Copper) a naturally occurring triamino acid-copper complex identified in human biological fluids

Research showed that supplementation with spermidine can literally prolong the lifespan