Freezing causes ice crystal formation that physically disrupts peptide chains
Storage: Desiccated, protected from light, stored at 20 C or below
When Cochrane reviewers grade an evidence base as very low quality despite a positive pooled effect, this is usually what they are reacting to: not that the benefit is fake, but that the conditions under which it was measured are the conditions that reliably make benefits look bigger than they are
Savari R, Shafiei M, Galehdari H, Kesmati M
This article covers what makes the topical delivery format distinct, why the stratum corneum penetration profile works in GHK-Cus favor, and how the serum compares to other cosmetic peptides
Supplementation: Glutathione supplements (in liposomal or reduced forms for better absorption) can provide a direct increase in glutathione levels in the body