- GHK-Cu: Does it have side effects or is it completely safe? For topical cosmetic use, one 24-hour study in cultured skin cells found a low potential for irritation, but no clinical trial has characterised its side effects on the scalp. Injected or oral GHK-Cu has no published human safety data, and the FDA lists injectable GHK-Cu among compounding substances that may present significant safety risks.
Molecule the body uses for energy, used as a cosmetic hair-lotion ingredient
scalp tattoos to mimic the appearance of light stubble
Protein that blocks activin, a growth-regulating signal
Hormone that regulates sleep, sold as a supplement
herb and oil thought to stimulate skin and hair