ghk-cu peptide structure Copper GHK-Cu for Hair Growth: Protocols
Description
The "best" peptide for a marathon runner recovering from a tendon injury is different from the best one for someone focused on weight loss, which is different again from someone whose main goal is better sleep and graceful aging

Dihexa acts as an allosteric activator of the HGF/c-Met receptor system in the brain
Draznin B
Over time, collagen and elastin production declines, leading to thinner, looser skin

That is what separates it from research-use-only vials sold without a prescription
P., Thompson, D., Selby, P
