GHK-Cu Explained: The Copper Tripeptide Behind Modern Skin and Scalp Care You’ve seen it on the label. You’ve maybe even seen it on Instagram, sandwiched between “glow” and “firming” in someone’s serum review. But ask most people what GHK-Cu actually is, and you’ll get a shrug. Here’s the short version: GHK-Cu is a naturally occurring […]