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Didangelos, Triantafyllos, Eleni Karlafti, Evangelia Kotzakioulafi, Zisis Kontoninas, Charalampos Margaritidis, Parthena Giannoulaki, and Konstantinos Kantartzis

If you had to pick one: GHK-Cu has broader biological reach (roughly 4,000 genes modulated versus 300-500 for retinol) [3] and a higher responder rate for collagen improvement in the only direct comparison

Takahashi A, Asakura M, Ito S, Min KD, Shindo K, Yan Y, Liao Y, Yamazaki S, Sanada S, Asano Y, et al

Additionally, while DXA scans were reviewed for validity by the investigators, scans were conducted at different fee-for-service facilities for each participant