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where do u inject ghk cu How Much GHK-Cu Should You Daily? Doctor Explains “Is GHK-Cu actually worth it?”
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Ackerman JE, Best KT, Muscat SN, Loiselle AE
PT-141, also known as Bremelanotide, acts as a melanocortin receptor agonist that stimulates melanocortin receptors in the brain associated with sexual desire and arousal
10.1210/en.2003-2350 Endocrinology 71 GuertinD

A bunch of studies from 2012 "confirms the ability of copper peptides to improve aging skin conditions, which make them indispensable in anti-aging and protective cosmetic products." Several research theories suggest that "bioactive peptides hold great potential for cancer therapy and diagnostics." Thereby indicating that peptides are safe for topical use