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Neither is universally "better"-they are related copper peptides with similar roles in collagen and repair
doi: 10.3389/fimmu.2021.641082 15 BoothJ
GHK-Cu has been extensively studied in dermatology, extracellular-matrix, and tissue-repair research contexts
These results are also consistent with earlier clinical findings with non-liposomal GSH 31 and observed correlations of GSH content with NK cell activity 44
