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Head-to-head evidence comparison — which supplement is right for you?
GHRP-6 wins 1 of 3 categories. Both are solid choices — the best pick depends on your specific goals.
Verdict
Mostly mechanism / observational
Top outcomes
Verdict
Mostly mechanism / observational
Top outcomes
Shared outcomes (1)
Outcomes where both GHRP-2 and GHRP-6 have evidence — compare verdict strength side-by-side.
No legitimate self-administration dose exists. Japan's approved DIAGNOSTIC use is a single 100 µg IV dose for a GH-stimulation test. Grey-market injectable protocols (~100 µg subcutaneous, 1-3×/day) are unapproved and unvalidated.
any
None — diagnostic IV use is clinician-administered; there is no validated self-use form
No validated human dose for any physique or anti-aging use exists. In clinical research GHRP-6 has been given as a single ~1 mcg/kg dose for provocative GH/HPA-axis testing, and at 100-400 mcg/kg in single-dose pharmacokinetic work. Anecdotal grey-market 'GH-boosting' protocols circulate online but have no clinical basis, no efficacy validation, and should not be read as a recommendation.
any
None — no form has validated human efficacy or an approved standard
Minutes (GH pulse); days-weeks (IGF-1)
Hours
Acute
Throughout use
N/A
Minutes to hours
Within an hour of dosing
Within 30-90 min
Growth Hormone Secretagogue Treatment in Hypogonadal Men Raises Serum Insulin-Like Growth Factor-1 Levels.
Am J Mens Health (2017) · Observational · n=14
Retrospective review of men on testosterone therapy seeking lean-mass gain and fat loss, prescribed GHRP-2/GHRP-6 plus sermorelin three times daily
Differential pulsatile secretagogue control of GH secretion in healthy men.
Am J Physiol Regul Integr Comp Physiol (2013) · Rct · n=26
Prospectively randomized, placebo-controlled, double-blind crossover in 26 healthy older men
Regulated recovery of pulsatile growth hormone secretion from negative feedback: a preclinical investigation.
Am J Physiol Regul Integr Comp Physiol (2011) · Rct · n=25
25 healthy men and women studied eight times each under an experimental GH feedback clamp
Pharmacokinetic study of Growth Hormone-Releasing Peptide 6 (GHRP-6) in nine male healthy volunteers.
Eur J Pharm Sci (2013) · Pilot · n=9
Phase-1 pharmacokinetic study in nine healthy men given a single IV bolus of 100, 200 or 400 mcg/kg GHRP-6, quantified by a validated LC-MS method
Diagnosis of growth hormone deficiency in adults: provocative testing with GHRP6 in comparison to the insulin tolerance test.
Horm Metab Res (2009) · Pilot · n=69
49 patients with suspected hypothalamic/pituitary disease plus 20 healthy controls underwent GHRP-6 (1 mcg/kg) testing; patients also had the insulin tolerance test
Effect of obesity and morbid obesity on the growth hormone (GH) secretion elicited by the combined GHRH + GHRP-6 test.
Clin Endocrinol (Oxf) (2006) · Observational · n=542
GHRH + GHRP-6-induced GH peaks evaluated in 542 subjects (healthy normal-weight, overweight, obese, morbidly obese, and GH-deficient patients)
GHRP-6 has gradable evidence while GHRP-2 has insufficient evidence to score and wins in 1 of 3 categories.
No known interactions between GHRP-2 and GHRP-6 have been documented in our database. However, always consult a healthcare provider before combining supplements.