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GHK-Cu (glycyl-L-histidyl-L-lysine complexed with copper 2+) is one of the most evidence-supported regenerative peptides available in cosmetics, with peer-reviewed data spanning collagen synthesis, gene-expression modulation, wound healing, and skin laxity
doi: 10.3389/fimmu.2022.985886 84 RibeiroRCarvalhoMJGoncalvesJMoreiraJN
Alternatively, having too much of it, especially in combination with poor sleep or high stress, can have the opposite effect
C.RonE.SchatzkinA.et al (2011)
Dose-related effect of intravenous L-arginine on muscular blood flow of the calf in patients with peripheral vascular disease: a H215O positron emission tomography study