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In a separate trial, topical GHK-Cu was compared head-to-head with vitamin C cream and retinoic acid for collagen improvement
doi: 10.1016/j.bcp.2021.114711 143 JiangSHeMXiaoLSunYDingJLiWet al
Human cosmetic studies exist but predominantly test multi-ingredient formulations, making attribution to GHK Cu specifically difficult
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