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Signal peptides (like Matrixyl, Syn-Coll): Best compatibility with retinol Work synergistically Can apply together or separately Neurotransmitter peptides (like Argireline, Leuphasyl): Good compatibility but better separated Diff…
Evening routine (most common approach): Evening: Peptide serum + Retinol + Moisturizer Why: Retinol degrades with sun exposure; evening maximizes effectiveness Peptides can amplify retinol's overnight repair Separate AM/PM (alter…
Beyond topical skincare, some people use injectable peptides for anti-aging.