AOD-9604 is a small fragment from the end of human growth hormone — and that fragment seems to do one job, not the whole list.

Three amino acids and a copper atom — that’s GHK-Cu. Here’s why such a small molecule has spent decades in skin and wound-healing research.

Epitalon is a four-amino-acid peptide that gets a lot of buzz around aging research. Let’s separate what’s been studied from what hasn’t.

Selank is a synthetic version of a small piece of a natural human protein called tuftsin. Here’s the simple story of why labs study it.

BPC-157 is a small protein that researchers study for tissue repair. Here’s a plain-English breakdown of what it is and why labs care.