Studies showing meaningful hair outcomes typically used concentrations of 2% or higher, and the most successful dual-peptide formulations combine GHK-Cu (Glycyl-L-histidyl-L-lysine copper) with AHK-Cu (Alanyl-L-histidyl-L-lysine copper) the two peptides work via complementary pathways
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Gouaze V, Andrieu-Abadie N, Cuvillier O, Malagarie-Cazenave S, Frisach MF, Mirault ME et al
Because of that, the two products answer different workflow needs
Inhaled glutathione is another method, delivering glutathione directly into the lungs
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