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Layering Strategies The simplest workaround is to alternate the application of GHK-Cu and potentially incompatible active ingredients: Alternate Times of Day: Apply GHK-Cu in the morning and Vitamin C, retinoids, or acids at night

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10.1016/j.celrep.2019.10.128 131 SunZ.YuanX.WuJ.WangC.ZhangK.ZhangL.et al (2023)

A blue or purple appearance may be associated with copper coordination, but colour alone cannot verify identity, copper content, quantity, purity or suitability for a laboratory method

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