ghk-cu safety clinical studies The Effect of the Human Peptide GHK on Gene Expression Relevant to Nervous System Function and Cognitive Decline ghk-cu injection safety clinical trial

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CD36 promotes tubular ferroptosis by regulating the ubiquitination of FSP1 in acute kidney injury

The question of whether a serum "works topically" is largely a function of whether its molecules ever cross the skin barrier

Collagen comparison (thigh skin, 12 weeks): GHK-Cu improved collagen production in 70% of treated subjects, compared to 50% for vitamin C cream and 40% for retinoic acid (PMID 26236730)

This simplifies formulation but also means the peptide can degrade if storage conditions are poor