does ghk-cu topical work Peptide GHK-Cu for Skin: SIGNAL's Guide

Many popular peptides are currently only available on the black and grey market

In mice pretreated with buthionine sulfoxime to inhibit GSH synthesis and induce a deficient state, oral administration of GSH resulted in statistically significant increases in GSH concentrations in kidney, heart, lung, brain, small intestine, and skin, but not in the liver

That said, it remains the only head-to-head comparison available, and GHK-Cu won on the metric that was measured

However, just because you are taking the active form of glutathione does not necessarily mean that its getting into your cells

BMC Pharmacol Toxicol 2012;13:8

This mineral guards collagen-producing cells from UV and pollution damage while supporting your immune system to fight acne-causing bacteria