Most men who start taking their skin seriously end up with four separate products before they've even worked out if any of it does anything.A copper peptide serum. A Vitamin C serum. A Vitamin A serum. A hyaluronic acid serum. Four bottles, four routines to remember, four price tags — and no guarantee any of them are formulated to work alongside the others.That's the part nobody tells you. Actives don't automatically play well together. Vitamin C is notoriously unstable around copper — it's a known formulation problem, not a minor...
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