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Clean water and salt licks blocks were accessed ad libitum

Specific application sequences Sequence 1: Peptides first, then retinol (same routine) Cleanse face Apply peptide serum to damp skin Wait 1-2 minutes for absorption Apply retinol Wait 1-2 minutes Apply moisturizer Best for: Most peptides (Matrixyl, Syn-Coll, general collagen peptides) Sequence 2: Retinol first, then peptides (less common) This is rarely recommended because retinol benefits from being closer to skin, and peptides are often in hydrating serums that work well after retinol

Salt AN, Sirjani DB, Hartsock JJ, Gill RM, Plontke SK

[DOI] [PubMed] [Google Scholar] 145.Shearer M.J., Newman P