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GHK Peptide as a Natural Modulator of Multiple Cellular Pathways in Skin Regeneration. BioMed Research International
To ensure consistent peptide concentrations across samples, the digested peptides were quantified using the Pierce Quantitative Colorimetric Peptide Assay (#23275, Thermo Fisher Scientific), a modified BCA assay
It's the form supported by the largest body of research, it's exceptionally stable in storage, which matters for consistent potency across batches, and it's the form most clinics and pharmacies use as a result
Additionally, as an antioxidant, glutathione reduces oxidative stress in the skin, which is relevant because oxidative stress (from UV sun exposure or inflammation) can stimulate more melanin production