What Is Hexarelin?
Hexarelin is one of the most potent growth hormone-releasing peptides (GHRPs) ever synthesized — and it does something no other GHRP does: it has a second, completely separate mechanism that protects the heart directly, independent of growth hormone entirely.
It's a synthetic six-amino acid peptide developed in the 1990s that mimics ghrelin's ability to stimulate GH secretion from the pituitary.[1] What researchers didn't expect was that hexarelin also binds the CD36 receptor in cardiac tissue, a pathway that appears to mediate meaningful cardioprotective effects in ischemia models.[2] That dual-receptor profile — GHSR plus CD36 — is what makes hexarelin genuinely interesting beyond the rest of the GHRP class.
It has no FDA approval, no compounding pathway, and sits firmly in research-compound territory. If you're reading this to understand what the science says, you're in the right place.
Hexarelin is a synthetic 6-amino acid GHRP that produces some of the strongest acute GH pulses in its class by binding the growth hormone secretagogue receptor (GHSR).[1]
It's the only GHRP with documented binding to the CD36 cardiac receptor, giving it direct cardioprotective properties separate from its GH-releasing activity.[2]