When you're dealing with compounds that have such specific and powerful effects, the purity of your material is everything
doi: 10.1016/j.cell.2005.10.044
Study shows that the patient with insulin resistance is fed with cysteine and glycine, a rich diet to raise glutathione level for two weeks, it also helps to decrease insulin resistance
TTM chelates bioavailable copper by forming a TTM-Cu-protein triple complex (128)
Progress in Brain Research 161:253261
Detailed biophysical studies (X-ray crystallography, EPR, NMR) elucidated that in GHK-Cu, the Cu(II) ion is coordinated by the imidazole side chain nitrogen of histidine, the alpha-amino nitrogen of glycine, and the deprotonated amide nitrogen of the glycine-histidine bond