quicksilver scientific liposomal glutathione supplement Glutathione Liposomal – Seattle Integrative

The Hostynek and Maibach group at UCSF measured exactly this in 2011: human skin permeation of GHK-Cu as a function of skin layer, with the result that the peptide accumulates in the upper stratum corneum but does not pass through to viable epidermis or dermis in any meaningful quantity 4

Topical GHK-Cu is generally considered safe for daily use and is commonly applied once or twice per day

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Skogheim TS, Weyde KVF, Engel SM, Aase H, Surn P, ie MG, Biele G, Reichborn-Kjennerud T, Caspersen IH, Hornig M, Haug LS, Villanger GD (2021) Metal and essential element concentrations during pregnancy and associations with autism spectrum disorder and attention-deficit/hyperactivity disorder in children

Topical vs Injectable GHK-Cu: Which Is Better

No, the FDA has not approved Glutathione IV treatment