GHK-Cu is one of several copper-peptide complexes in the cosmetic ingredient literature, and its specific identity (tripeptide with the GHK sequence, copper(II) complex, the characteristic blue color and coordination geometry) distinguishes it within that broader cosmetic peptide family
Both L-glutathione and glutathione refer to the same tripeptide compound
Ruel N, Markova DZ, Adams SL, et al
Its not just about what you eat, though
doi: 10.1016/j.jss.2012.06.024
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