GHRP-6 5mg

Buy GHRP-6 5mg

GHRP-6 (Growth Hormone Releasing Peptide-6) is a synthetic hexapeptide and a powerful growth hormone secretagogue. It acts similarly to ghrelin as it interacts with the growth hormone secretagogue receptor (GHS-R1a) located in the pituitary and hypothalamus. In laboratory studies, it is being investigated for its potential to induce pulsatile growth hormone (GH) secretion, enhance IGF-1 concentrations, and act on metabolism and anabolic processes. The lot comes as a ≥99% (HPLC) high-purity lyophilized powder in 50mg vials, and is made in the USA. GHRP-6 is for research purposes only, not human consumption or any kind of off-label use. For research use only. Strictly not for human consumption.

Mechanism of Action 

GHRP-6 selectively binds to and activates the GHS-R1a receptor, a type of G-protein-coupled receptor found on pituitary somatotrophs and hypothalamic neuronal tissue. Binding of GHRP to the receptor activates G_q/11- protein signaling, leading to phospholipase C activation and  subsequent enhancement of intracellular inositol 1,4,5-trisphosphate (IP3) and calcium mobilization, which ultimately stimulates GH release. This track augments GH pulse amplitude and frequency in the majority of models, with minimal rise in prolactin or cortisol. One such compound, GHRP-6 has synergistic interactions with GHRH analogs (CJC-1295 No DAC) to elicit supra-additive GH secretion. It enhances hypothalamic neuropeptide Y expression to stimulate appetite, and also modulates dopaminergic and GABAergic transmission in circuits involving reward and stress. Research on the GH/IGF-1 axis dynamics, metabolic regulation, appetite control, and anabolic/catabolic balance examines these mechanisms.

GHRP-6 Molecular Structure and Chemical Properties

GHRP-6 (Growth Hormone-Releasing Peptide-6) is a synthetic hexapeptide containing six amino acids. Its structure includes two D-amino acids, D-tryptophan and D-phenylalanine, along with an amidated C-terminus. These structural features influence its resistance to enzymatic breakdown and interaction with the growth hormone secretagogue receptor (GHSR).

GHRP-6 Chemical Properties Table

Source: PubChem’s stereochemically defined growth hormone-releasing hexapeptide record.

GHRP-6 Research

1. GH and IGF-1 Secretion Studies

GHRP-6 promotes a dose-dependent, pulsatile GH release from pituitary somatotrophs in preclinical models. In vitro experiments in rat and human pituitary cells suggest that GHRP-6 (10⁻⁸ to 10⁻⁶ M) also stimulates GH secretion by 5- to 10-fold, an effect enhanced by coadministration with GHRH. Several studies on rodent models in vivo (100–300 µg/kg s.c. or i.p.) demonstrated that plasma GH and IGF-1 could be elevated for hours after administration, and repeated dosing further increased these levels without notable desensitization of receptors.

2. Appetite Stimulation and Metabolic Effects

In the current animal models of GHRP-6, food intake is strongly stimulated by activation of hypothalamic neuropeptide Y. In rats and mice, doses between 100–500 µg/kg promote larger and more frequent meals. Studies investigate its function in energy equilibrium; enhanced fat oxidation and less adiposity occur with some HF models, even when hyperphagia is present. In metabolic studies, it also influences insulin sensitivity and glucose homeostasis.

3. Synergistic Effects with GHRH Analogs

GHRP-6 elicits supra-additive GH release in animal models when given with GHRH or CJC-1295, no DAC. When administered in doses of 100 µg/kg GHRP-6 + 100 µg/kg GHRH analog, GH peaks then register as high as 10- to 20-fold over baseline, validating studies involving combined protocols for secretagogues assessing the effect of GH pulsatility on anabolic signaler activation.

4. Neuroendocrine and Behavioral Research

GHRP-6 modulates hypothalamic-pituitary-adrenal axis activity and decreases stress-related behaviors in rodents under stress and anxiety models. It acts on dopaminergic reward pathways, enhancing both locomotor activity and exploratory behavior in open-field tests. Research explores its potential for models of depression, addiction, and cognitive function through signaling via the ghrelin receptor.

5. Muscle and Tissue Repair Models

GHRP-6 also increases nitrogen retention in exercise and injury models, leading to increased protein synthesis and muscle recovery. Studies in rats demonstrate enhanced wound healing and tendon repair when combined with other peptides, which may be attributed to the higher IGF-1 concentration and local growth factor expression. GHRP-6 is still investigational — no major approval in humans has been issued. Recent and future studies focus on its actions in the regulation of GH secretion, appetite, metabolic homeostasis, and neuroendocrine circuitry.

Handling and Storage of GHRP-6

Unopened vials are stored refrigerated at 2–8°C, light and moisture-protected. Do not freeze. Reconstitute under aseptic conditions with either bacteriostatic water or sterile diluent. Refrigerate reconstituted solutions. Use within the stability period for the protocol (assuming typically 4–6 weeks at 2–8°C). Avoid repeated freeze-thaw cycles. Every time, use sterile technique, gloves, and proper PPE.

Important Disclaimer

GHRP-6 is an investigational research peptide. For in vitro or in vivo laboratory studies only. Not approved for human therapeutic, anabolic, appetite-modulating, or other medical use by the FDA/EMA or any authority. Categorized as a research chemical (WADA S0 non-approved substances group). Preclinical results do not predict human outcomes. No claims are made about safety, efficacy or benefits in humans. Risks may involve immunogenicity or contaminants. Only for use in qualified research laboratories under institutional control. All compounds sold at Orion Peptides are for laboratory use only — not for human or veterinary use.  

Referenced Citations  

• Bowers CY, et al. (1991). GHRP-6: A potent growth hormone-releasing peptide. Endocrinology.  
• Raun K, et al. (1998). Ipamorelin is the first selective growth hormone secretagogue. European Journal of Endocrinology.
• Sigalos JT, Pastuszak AW. (2018). The safety and efficacy of growth hormone secretagogues. Sexual Medicine Reviews.
• Howard AD, et al. (1996). A receptor in the pituitary and hypothalamus that functions in growth hormone release. Science.