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2009 RCT cohort) You already own a microinfusion device You want a regenerative active with 50+ years of mechanism data Skip If Active eczema or rosacea flare Known copper allergy Pregnancy or breastfeeding (until physician-cleared) On oral isotretinoin within last 6 months You expect overnight results from any peptide Realistic timeline

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Peptides are short chains of amino acids typically between 2 and 50 that serve as building blocks for proteins like collagen, keratin, and elastin

Glutathione has a real, if modest and inconsistent, effect on pigmentation in some studies

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That distinction may sound tidy online, but it does not change the central problem: patients still need better evidence, better sourcing clarity, and better medical supervision than the peptide world usually provides