skin biology super ghk-cu serum buy 7% Accelerant Copper Peptide GHK-CU Serum, Raw
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10.1007/s00198-016-3719-z [DOI] [PubMed] [Google Scholar] 14

Glutathione supports Skin Brightening and Anti-Aging As an antioxidant, Glutathione protects against oxidative damage from sun exposure, pollution, and other substances that prematurely age skin

by the same mechanism, DHLA prevents Cu 2+ - and Cd 2+ -induced lipid peroxidation [16]

I've no idea if methylcobalamin might provoke a reaction
