The treatment comparison reveals GHK-Cu discontinuation profile proving more favorable than retinoids (less dependency, no rebound, better benefit retention) while similar to vitamin C and niacinamide (gradual decline, moderate long-term retention, low dependency)
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10.1089/ars.2011.3904 Summary Keywords nitric oxide, eNOS, endothelium, preclinical evidence, clinical trials Citation Gonzalez M, Clayton S, Wauson E, Christian D and Tran Q-K (2025) Promotion of nitric oxide production: mechanisms, strategies, and possibilities
J Biol Sci (2015) 1:16
Depending on the injection, it might include other B vitamins