Breckas nasal spray runs $375, the patch version $575 a month, and almost nobody takes a single peptide
Free Cu2+ is toxic (Fenton reactions, hydroxyl radicals), but the GHK-Cu complex is stable, diffusible and delivers copper in a targeted manner to copper-dependent metalloenzymes: lysyl oxidase (collagen/elastin crosslinking), Cu/Zn superoxide dismutase (SOD1, antioxidant defence), tyrosinase (controlled melanogenesis), dopamine-beta-hydroxylase
Like all proteins in solution, it degrades over time through multiple mechanisms
Its a skin whitening glutathione tablet
Milk and other dairy products, such as yogurt and cheese, are excellent sources of protein and several vitamins and minerals, including vitamin B12
Jones DP et al