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Copper peptides stimulate collagen and elastin production by acting as a signal molecule, says Dr

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The combination with hyaluronic acid (6 mg) in the rabbit model produced superior outcomes to either compound alone, which has led some practitioners to explore AOD-9604 in joint health contexts

Why they work together: Matrixyl stimulates collagen and elastin production Complements retinol's collagen-boosting without irritation Repairs skin barrier that retinol may compromise Well-studied combination in clinical settings Application strategy: Can use in same routine (layer peptide first, then retinol) Or alternate (peptides AM, retinol PM) Popular products with Matrixyl: The Ordinary Matrixyl 10% + HA, The INKEY List Collagen Peptide Serum Argireline (Acetyl Hexapeptide-8) Compatibility: Good, but better applied separately