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International Journal of Dermatology, aot 2021, pages 1013-1018 2

One compound that has caught attention is GHK-Cu, a naturally occurring copper peptide widely used in skin and hair formulations

It wont replace diet, training, or sleep

GHK-Cu stimulates the synthesis and breakdown of the water-holding molecules called glycosaminoglycans

To prevent this from happening, I recommend doing a full thyroid panel to get the full picture of whats going on with an individuals thyroid function

Biochim et Biophys Acta (BBA) - Enzymol 341:1526 Takehara S, Terayama H (1984) A serum factor stimulating cathepsin D-release from erythrocytes or ghosts