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GHRP-6

A synthetic growth hormone secretagogue known for potent GH release and significant appetite stimulation through ghrelin receptor activation.

ModerateModerate Data

Always consult a qualified clinician

This information is for educational purposes. Peptide therapy should be guided by a licensed healthcare provider. Connect with a Noho clinician

What is GHRP-6?

GHRP-6 is one of the earliest synthetic growth hormone releasing peptides developed. It acts on the ghrelin receptor to stimulate growth hormone release from the pituitary gland. It is notable for its strong appetite-stimulating effects, which can be beneficial for those needing to increase caloric intake but may be undesirable for others.

Why People Talk About It

Growth hormone release

Moderate

Appetite stimulation

Strong

Gastric motility improvement

Emerging

Body composition changes

Emerging

How It Works

GHRP-6 mimics the hunger hormone ghrelin, telling your brain to release growth hormone and increase appetite. It creates a strong growth hormone pulse but also significantly increases the desire to eat.

Common Questions

Safety Information

Important Safety Notes

Common Side Effects

Intense hungerWater retentionCortisol elevationTingling

Cautions

  • Strong appetite stimulation may be problematic
  • Elevates cortisol more than other GHRPs
  • Not FDA-approved
  • Monitor blood sugar levels

What We Don't Know

Long-term metabolic effects of chronic ghrelin receptor activation are not fully understood.

Published Research

35 studies

Insulinotropic action of bombesin-like peptides mediated by gastrin-releasing peptide receptors in steers

Randomized Controlled TrialPMID: 26812312

Bombesin-like peptides stimulate growth hormone secretion mediated by the gastrin-releasing peptide receptor in cattle

Randomized Controlled TrialPMID: 22868212

Ghrelin-attenuated cognitive dysfunction in streptozotocin-induced diabetic rats

Randomized Controlled TrialPMID: 22005105

Adrenocorticotrophic hormone (ACTH) responsiveness to ghrelin increases after 6 months of ketoconazole use in patients with Cushing's disease: comparison with GH-releasing peptide-6 (GHRP-6)

Randomized Controlled TrialPMID: 19453623

Effects of ghrelin, growth hormone-releasing peptide-6, and growth hormone-releasing hormone on growth hormone, adrenocorticotropic hormone, and cortisol release in type 1 diabetes mellitus

Randomized Controlled TrialPMID: 20189610

Decreased ghrelin-induced GH release in thyrotoxicosis: comparison with GH-releasing peptide-6 (GHRP-6) and GHRH

Randomized Controlled TrialPMID: 17410412

GHRP-6 is able to stimulate cortisol and ACTH release in patients with Cushing's disease: comparison with DDAVP

Randomized Controlled TrialPMID: 12809173

Effects of growth hormone-releasing peptides in healthy dogs and in dogs with pituitary-dependent hyperadrenocorticism

Randomized Controlled TrialPMID: 12431802

Effects of fasting and pegvisomant on the GH-releasing hormone and GH-releasing peptide-6 stimulated growth hormone secretion

Randomized Controlled TrialPMID: 11678828

Acute dexamethasone administration enhances GH responsiveness to GH releasing peptide-6 (GHRP-6) in man

Randomized Controlled TrialPMID: 10583306

Tyr-Ala-Hexarelin, a synthetic octapeptide, possesses the same endocrine activities of Hexarelin and GHRP-2 in humans

Randomized Controlled TrialPMID: 10195374

Growth hormone (GH) response to GH-releasing peptide-6 and GH-releasing hormone in normal-weight and overweight patients with non-insulin-dependent diabetes mellitus

Randomized Controlled TrialPMID: 10206449

Growth hormone (GH)-releasing peptide-6 requires endogenous hypothalamic GH-releasing hormone for maximal GH stimulation

Randomized Controlled TrialPMID: 9543138

Different effects of growth hormone releasing peptide (GHRP-6) and GH-releasing hormone on GH release in endogenous and exogenous hypercortisolism

Randomized Controlled TrialPMID: 9274702

Growth hormone responses to GH-releasing peptide (GHRP-6) in hypothyroidism

Randomized Controlled TrialPMID: 9156038

Influence of endogenous cholinergic tone and growth hormone-releasing peptide-6 on exercise induced growth hormone release

Randomized Controlled TrialPMID: 9135702

Hexarelin, a synthetic growth hormone releasing peptide, stimulates prolactin secretion in acromegalic but not in hyperprolactinaemic patients

Randomized Controlled TrialPMID: 8706295

Growth hormone secretion after the administration of GHRP-6 or GHRH combined with GHRP-6 does not decline in late adulthood

Randomized Controlled TrialPMID: 7734029

Growth hormone-releasing peptide-6 stimulates sleep, growth hormone, ACTH and cortisol release in normal man

Randomized Controlled TrialPMID: 7617137

The effect of an opiate antagonist on the hormonal changes induced by hexarelin

Randomized Controlled TrialPMID: 7586608

Comparison of the effects of growth hormone-releasing hormone and hexarelin, a novel growth hormone-releasing peptide-6 analog, on growth hormone secretion in humans with or without glucocorticoid excess

Randomized Controlled TrialPMID: 7561633

Role of epidermal growth factor and growth hormone-releasing peptide-6 in acceleration of renal tissue repair after kanamycin overdosing in rats

Clinical TrialPMID: 25194405

Pharmacokinetic study of Growth Hormone-Releasing Peptide 6 (GHRP-6) in nine male healthy volunteers

Phase I Clinical TrialPMID: 23099431

Effects of ghrelin, GH-releasing peptide-6 (GHRP-6) and GHRH on GH, ACTH and cortisol release in hyperthyroidism before and after treatment

Clinical TrialPMID: 20602173

Diagnosis of adrenal insufficiency using the GHRP-6 Test: comparison with the insulin tolerance test in patients with hypothalamic-pituitary-adrenal disease

Clinical TrialPMID: 19946832

Ghrelin and GHRP-6-induced ACTH and cortisol release in thyrotoxicosis

Clinical TrialPMID: 19396632

Association between tumoral GH-releasing peptide receptor type 1a mRNA expression and in vivo response to GH-releasing peptide-6 in ACTH-dependent Cushing's syndrome patients

Clinical TrialPMID: 18426818

Decreased GH secretion and enhanced ACTH and cortisol release after ghrelin administration in Cushing's disease: comparison with GH-releasing peptide-6 (GHRP-6) and GHRH

Clinical TrialPMID: 16832586

Growth hormone response to GHRH + GHRP-6 in type 2 diabetes during euglycemic and hyperglycemic clamp

Clinical TrialPMID: 14693411

Hexarelin decreases slow-wave sleep and stimulates the secretion of GH, ACTH, cortisol and prolactin during sleep in healthy volunteers

Clinical TrialPMID: 15177700

Growth hormone releasing hexapeptide-6 (GHRP-6) test in the diagnosis of GH-deficiency.

ReviewPMID: 8887178

Evaluation of pituitary GH reserve with GHRP-6.

ReviewPMID: 8887173

Growth hormone-releasing peptide 6 (GHRP-6) hydrogel for acute kidney injury therapy via metabolic regulation.

PreclinicalPMID: 41327290

[D-Lys3]-GHRP-6 exhibits pro-autophagic effects on skeletal muscle.

PreclinicalPMID: 25450862

Growth hormone releasing peptide-6 (GHRP-6) prevents doxorubicin-induced myocardial and extra-myocardial damages by activating prosurvival mechanisms.

PreclinicalPMID: 38873418

Always consult a qualified clinician

This information is for educational purposes. Peptide therapy should be guided by a licensed healthcare provider. Connect with a Noho clinician

Related Peptides

Quick Facts

Class
Growth Hormone Secretagogue
Evidence
Moderate
Safety
Moderate Data
Updated
Feb 2026
Citations
35PubMed

Also known as

Growth Hormone Releasing Peptide-6

Tags

Growth HormoneAppetiteBody CompositionRecovery

Related Goals

Evidence Score

Overall Confidence65%

Clinical Trials

View Clinical Trials

Links to ClinicalTrials.gov for reference. Listing does not imply endorsement.

Clinician Guided

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