is glutathione a peptide NAD, Glutathione, Peptides, and Other Hormone Therapies Glutathione - Wikipedia

But in my case I believe it does prove it, as I said my b12 does become depleted

R., DAlessio, A., Pergameno, M

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GHK, which declines with age, has health promoting effects on many tissues such as chondrocytes, liver cells and human fibroblasts, improves wound healing and tissue regeneration (skin, hair follicles, stomach and intestinal linings, boney tissue), increases collagen, decorin, angiogenesis, and nerve outgrowth, possesses anti-oxidant, anti-inflammatory, anti-pain and anti-anxiety effects, increases cellular stemness and the secretion of trophic factors by mesenchymal stem cells

The peptides sequence (Gly-Glu-Pro-Pro-Pro-Gly-Lys-Pro-Ala-Asp-Asp-Ala-Gly-Leu-Val) was first characterized by research groups investigating cytoprotective properties of gastric juice-derived compounds