GHK-Cu
GHK-Cu is a natural copper peptide used in skin creams and sold as injections. What cream studies show, what failed, and FDA’s 2026 status.
Skin and tanning
AHK-Cu
AHK-Cu is a copper peptide promoted for hair growth and skin. What it does in lab dishes, what an old patent claimed, and why no human data exist.
Glutathione
What glutathione does in your cells, what pills, creams, sprays and IV drips actually changed in trials, and FDA warnings on IV products.