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However, formulation studies often test several active ingredients together, making it difficult to attribute the result to one peptide.[2] A 2026 systematic review and meta-analysis of oral and topical peptides, covering 19 randomised controlled trials and 1,341 participants, found that peptides significantly improved skin hydration and brightness, with a modest pooled effect on wrinkle reduction (mean difference 0.27, p = 0.04)
The unusual linkage makes glutathione resistant to many of the protein-cleaving enzymes that would otherwise dismantle it
J., Ezzati, M., Alonso-Alconada, D., Hausenloy, D
Glycolic Acid 1% INDICATION Wrinkles, ageing skin, keratosis, pigmentary spots
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