Clinical Status: GHK-Cu is an endogenous copper-binding peptide studied in both animal and human research models for wound healing, skin regeneration, and anti-aging applications
Lancet 359:20532058 Belch J, Hiatt WR, Baumgartner I, Driver IV, Nikol S, Norgren L, Van Belle E, Committees T, Investigators (2011) Effect of fibroblast growth factor NV1FGF on amputation and death: a randomised placebo-controlled trial of gene therapy in critical limb ischaemia
So what we assume that the glutathione was actually getting broken down, the cysteine was getting reabsorbed, and we're getting used to produce glutathione again
The tradeoff is speed: cortisone gives faster symptom relief