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The conventional guidance, echoed by formulation chemists writing for Cosmetics & Toiletries and confirmed in Byrdies ingredient analysis, is to avoid layering an L-ascorbic acid serum directly with a copper peptide serum in the same routine step
[DOI] [PMC free article] [PubMed] [Google Scholar] 20.Areco V, Rivoira MA, Rodriguez V, Marchionatti AM, Carpentieri A, Tolosa de Talamoni N
Both of these contain proteins that trigger gut and immune irritation
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