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Plasma levels of GHK measure approximately 200 ng/mL at age 20 but decline to around 80 ng/mL by age 60, a decline that coincides with the noticeable decrease in regenerative capacity across tissues

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There are no well-controlled clinical trials assessing IGF-1 LR3 itself in humans, since IGF-1 LR3 is an investigational analog and not approved for therapeutic use

2009;296:L565

[PubMed] [Google Scholar] 254.Irwin MR, Cole SW
