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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

AOD-9604 is a growth hormone fragment that has specific research evidence for cartilage regeneration in osteoarthritis models

doi: 10.1038/s41598-021-86425-6 193 ProalAMarshallT

There is not as much evidence regarding long-term efficacy or safety of gel vitamin B12 compared to injections, but at this time it appears B12 gel works similarly to raise blood levels