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Martin, L.F., et al

B12 absorption is regulated through intrinsic factor, which is produced by gastric parietal cells in the stomach, with the B12-intrinsic factor complex being absorbed in the terminal ileum

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

The most common error patients make is applying one peptides frequency to another

doi: 10.1093/rheumatology/keq108 183 AngiolilliCBaetenDLRadstakeTRReedquistKA

B., Milavic, M., Sikiric, S., Stilinovic, I., Simeon, P., Knezevic, M., Kolak, T., Tepes, M., Simonji, K., Strbe, S., Gabaj, N