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Collagen Production Several studies referenced by the review article showed GHK-Cu increased collagen synthesis and glycosaminoglycan production

Sobhana, P

[Google Scholar] Jiang BG, Jia N, Jiang JF, Zheng YC, Chu YL, Jiang RR, Wang YW, Liu HB, Wei R, Zhang WH, et al

Evidence on the benefits of systemic therapy is limited for several reasons: reliance on mostly small and predominantly female samples, short study durations, methodologic heterogeneity, and a lack of consensus on which outcome measures are clinically relevant

Even if you can appropriately figure out how to use them, you still cant ensure quality in a completely unregulated environment of research chemicals

doi: 10.3390/nu9111211 115