Adverse effect · GHRP-6

How common is safety in humans with GHRP-6?

C
Grade C — weak human evidenceDiagnostic use · effect size: small · adverse
Short answerWeak human evidence. Diagnostic use: enough to be interesting, not enough to count on. Where an effect is seen it is a small effect. As a single diagnostic dose, flushing was the only side effect reported. Repeated-use safety is not established.

What the studies show

As a single diagnostic dose, flushing was the only side effect reported. Repeated-use safety is not established.

“During administration of GHRP-6, the only side effects observed were flush symptoms.”

Verbatim, from the abstractPetersenn S, et al. Diagnosis of growth hormone deficiency in adults by testing with GHRP-6 alone or with GHRH: comparison with the insulin tolerance test. Eur J Endocrinol, 2002;146:667–672

A few small or poorly-controlled human studies. Enough to be interesting; not enough to count on. Most of what gets called “clinically proven” online lives here.

  1. 1

In context

GHRP-6 is the first of the growth-hormone-releasing peptides, a synthetic six-amino-acid ghrelin mimic. In studies it raises growth hormone as reliably as the standard insulin tolerance test, which makes it a useful diagnostic; it also stimulates appetite. As with the rest of its class, there is no controlled human trial showing it builds muscle or reduces fat, and it is banned in sport.

GHRP-6 is not approved. Legal status differs by country — see the regulation section or the jurisdiction pages.

Questions

Is GHRP-6 proven to cause safety in humans?
No. The human evidence is weak (Diagnostic use); LYO grades it C.
What studies are behind the grade?
As a single diagnostic dose, flushing was the only side effect reported. Repeated-use safety is not established.
Is GHRP-6 approved for this?
No. GHRP-6 is not approved; it is not an approved medicine for any indication in the jurisdictions LYO covers.

Other outcomes for GHRP-6

Written and maintained by LYO Research — how pages are written and checked. Reviewed 3 September 2026. Grades count human evidence only; see how LYO grades. Not medical advice. Correct this page →