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Disclosure: I am developing an ascorbic acid (Vitamin C) formula. I didn't find a lot of evidence to suggest you can't use copper tripeptides with acids, ascorbic acid (Vitamin C), or retinoids. Can You Mix GHK Cu, TB 500 & BPC 157? Myth Debunked Theoretical study of copper binding to GHK peptide ScienceDirect How GHK Cu Tightens Loose Skin: Evidence & Protocols GHK CU 99% Pure HPLC Tested Research Peptide Pure U.S. Peptides
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