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"Chapter 23: Zoster"

doi: 10.1126/scitranslmed.aba0624

Issue 4: ingredient interactions in multi-product cosmetic routines Several reviews note that the chelated copper bond can be disrupted by low pH conditions associated with some other cosmetic actives, including certain forms of vitamin C and AHA or BHA exfoliants

Thats a 100-fold difference in how much peptide researchers are using, all targeting the same downstream mechanism

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