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The free tripeptide without copper (GHK, CAS 49557-75-7) is a distinct compound: C 14 H 24 N 6 O 4 , 340.38 g/mol Glutathione & Thyroid Health: The Master Antioxidant Pack:5 Bottles Vitamins & Minerals https://lookaside.instagram.com/seo/google_widget/crawler/?media_id=3327394459633254719

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