ghk-cu 50mg copper peptide GHK-Cu - Copper Peptide for
Description
By restoring healthy Vitamin D levels, patients often experience improved energy, stronger immunity, and better long-term wellness

doi: 10.1038/cr.2009.139

And here is the protocol that addresses the actual bottleneck not the marketing opportunity built around it

In a subsequent group given three 50 g IN doses (1 day before lesioning, 1 h before lesioning, 1 day post-lesioning), lesioned rats had even greater neuroprotective and regenerative effects, showing that multiple smaller doses in short intervals were more effective than a larger single dose [36]
