ghk-cu hair growth clinical study randomized trial double blind A Randomized, Double‐Blind, Placebo‐ GHK-Cu Peptide for Hair Growth:

Extracellular matrix and collagen research Beyond the wound-healing context, GHK-Cu is used in research on extracellular matrix biology more generally including collagen synthesis, the cross-linking reactions catalyzed by lysyl oxidase, the deposition and remodeling of matrix in various cell-culture systems, and the broader matrix metabolism that connects to tissue mechanics and tissue function

A blend can be harder to verify than a single peptide, so the certificate of analysis matters even more

Additional NMR data are included in the Source Data file

Bottom line Peptides like insulin and GLP-1s have been lifesaving