Does GHRP-2 / GHRP-6 work?

Read Off Label rates the evidence for GHRP-2 / GHRP-6 as Weak and the benefit magnitude as med, producing an overall grade of C- (4.1/10). Largely superseded by ipamorelin due to cortisol/prolactin rise.

Is GHRP-2 / GHRP-6 safe?

GHRP-2 / GHRP-6 has a med risk profile in published human data. Legal status: Research peptide; banned sport. This is not medical advice — see the disclaimer.

Rankings / Muscle & Strength

GHRP-2 / GHRP-6

Muscle & Strength · Ghrelin receptor agonists (earlier generation)

Tier C-

Reviewed by Read Off Label · Last reviewed Jun 8, 2026 · How we grade

peptidegh-axisbanned

4.1 / 10

Tier C-

Ev 3 Bn 5 Sf 5

Bottom line

Read Off Label grades GHRP-2 / GHRP-6 as C- (4.1/10) based on weak evidence, med benefit magnitude, and a med-risk safety profile.

Largely superseded by ipamorelin due to cortisol/prolactin rise.

Typical use: GHRP-2: 100-300 mcg subQ 2-3x/day; GHRP-6: 100-150 mcg subQ 2-3x/day — Research peptide; banned sport.

What this is

Largely superseded by ipamorelin due to cortisol/prolactin rise. GHRP-6 famous for voracious hunger — sometimes intentionally used to aid bulking. Development-stage drugs abandoned by Kaken and Wyeth respectively.

Mechanism

Hexapeptides binding GHS-R1a; stimulate pituitary GH release; GHRP-6 notably induces hunger via central ghrelin signaling; GHRP-2 more potent but also raises cortisol and prolactin more than ipamorelin

Dose & route

GHRP-2: 100-300 mcg subQ 2-3x/day; GHRP-6: 100-150 mcg subQ 2-3x/day

Citations

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Common questions

Does GHRP-2 / GHRP-6 work?: Read Off Label rates the evidence for GHRP-2 / GHRP-6 as Weak and the benefit magnitude as med, producing an overall grade of C- (4.1/10). Largely superseded by ipamorelin due to cortisol/prolactin rise.
Is GHRP-2 / GHRP-6 safe?: GHRP-2 / GHRP-6 has a med risk profile in published human data. Legal status: Research peptide; banned sport. This is not medical advice — see the disclaimer.
What is the typical dose for GHRP-2 / GHRP-6?: GHRP-2: 100-300 mcg subQ 2-3x/day; GHRP-6: 100-150 mcg subQ 2-3x/day
How does GHRP-2 / GHRP-6 work?: Hexapeptides binding GHS-R1a; stimulate pituitary GH release; GHRP-6 notably induces hunger via central ghrelin signaling; GHRP-2 more potent but also raises cortisol and prolactin more than ipamorelin

This is an independent synthesis of published research by a non-clinician. Scores are opinions supported by citations, not prescriptions. See the full disclaimer and methodology for how this score was produced and what it does and doesn't mean.