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Whats well-supported mechanistically Collagen synthesis support (in lab models): an early, widely cited fibroblast study reported that GHK-Cu stimulated collagen synthesis in cultured fibroblasts at very low concentrations

Pepper Older Americans Independence Center (P30AG028740), and the University of Florida College of Veterinary Medicine

A However, in the review, there were a limited number of high-quality studies to examine, and the 2021 study involved animals rather than humans

It does not suddenly become poisonousjust less effective: Properly stored vitamins are likely safe past their expiration date for up to two years