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Topical collagen tripeptides (CTP): Pilot study (n=22, 4 weeks) showed reduced wrinkles, improved elasticity & skin density, and lower advanced glycation end products—with no adverse reactions .
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Micronized collagen: Clinical trial of topical micronized collagen demonstrated >20% wrinkle reduction, ~38% firmness gain, ~200% hydration increase in 4 weeks (n=55) .
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Collagen/peptide cosmeceuticals: Reviews confirm hyaluronic acid and peptide combinations stimulate collagen production, inhibit MMPs, and support firmness & hydration .
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Collagen peptide supplements: Orally consumed collagen peptides improved skin elasticity, hydration, dermal density, and wrinkle reduction over 4–8 weeks .