ghk-cu hair growth clinical study topical for Growth: What the Evidence Actually Shows Copper Peptides For Hair Loss:

Buccal and sublingual delivery can avoid some gastrointestinal degradation and first-pass pathways

To bee or not to bee: the potential efficacy and safety of bee venom acupuncture in humans

GHK-Cu exerts broad anti-inflammatory effects through its influence on approximately 31% of the human genome, specifically downregulating genes involved in inflammatory processes including interleukin-1, tumor necrosis factor-, and nuclear factor-B (NF-B) signaling while upregulating protective genes encoding antioxidant enzymes, DNA repair proteins, and anti-inflammatory mediators

Many peptides can maintain activity for many years