Hexarelin
Examorelin · Synthetic Growth Hormone Secretagogue
Hexarelin is one of the most potent synthetic growth hormone secretagogues available. It stimulates GH release by binding to the GHS-R1a receptor in the pituitary and hypothalamus, mimicking the action of ghrelin. Notably, Hexarelin demonstrates synergistic effects when combined with GHRH, producing GH responses greater than the arithmetic sum of either peptide alone. It also shows unique cardioprotective properties mediated through the CD36 receptor.
Overview
Hexarelin is one of the most potent synthetic growth hormone secretagogues available. It stimulates GH release by binding to the GHS-R1a receptor in the pituitary and hypothalamus, mimicking the action of ghrelin. Notably, Hexarelin demonstrates synergistic effects when combined with GHRH, producing GH responses greater than the arithmetic sum of either peptide alone. It also shows unique cardioprotective properties mediated through the CD36 receptor.
Hexarelin binds to the growth hormone secretagogue receptor 1a (GHS-R1a) in the brain and pituitary gland. This binding initiates a signaling cascade that stimulates somatotroph cells in the anterior pituitary to produce and release growth hormone. Hexarelin also has slight, dose-dependent effects on prolactin, ACTH, and cortisol release. Its cardioprotective effects are mediated through CD36 receptor activation and modulation of calcium channels in cardiomyocytes.
Research indications
What the compound has been studied for, grouped by body system. Effect size is the reported magnitude where it was measured — not a recommendation.
Most potent GHRP for stimulating endogenous growth hormone release from the pituitary.
Produces synergistic GH release when combined with GHRH, greater than sum of individual effects.
Significant increases in IGF-1 levels through enhanced GH secretion.
Protective effects on cardiac tissue mediated through CD36 receptor activation.
Reduces apoptosis of cardiomyocytes and controls cardiac action potential.
Cardiotropic effects mediated by elevation of Ca2+ influx through voltage-gated calcium channels.
Beneficial effects on lipid metabolism via CD36 receptor in non-obese insulin-resistant models.
Improved lean mass to fat ratio through GH and IGF-1 elevation.
A large effect in a weak study and a small effect in a strong one are different things. Effect size is never evidence of use in people.
- Class
- Synthetic hexapeptide
- Chain length
- 6 residues
- Molecular weight
- 887 Da
- Half-life
- ~1.5 h
- Typical dose
- 100-200 mcg per injection
- Frequency
- 2-3 times daily for optimal GH pulses
- Cycle length
- 8-12 weeks
- Storage
- Lyophilized: Room temperature. Reconstituted: 2-8°C, use within 28 days
Molecular data
- Type
- Synthetic hexapeptide
- Molecular weight
- 887 Da
- Chain length
- 6 residues
- Half-life
- 90 min
Dosing reference
Doses reported in the literature and by suppliers. These are a record of what has been used in research — reference, never instruction.
| Context | Route | Amount | Frequency |
|---|---|---|---|
| GH optimization | SubQ or IM | 100 mcg | 2-3x daily |
| Enhanced results | SubQ or IM | 200 mcg | 2-3x daily |
| With GHRH (synergy) | SubQ (combined) | 100 mcg each | 2-3x daily |
| Cardioprotection | SubQ | 100-200 mcg | 1-2x daily |
Interactions
Powerful synergy; combination produces GH response greater than sum of individual effects.
Research confirms synergistic GH release when co-administered.
Similar mechanism; typically not stacked together but can be alternated.
Same receptor target; Hexarelin is more potent with less appetite stimulation.
Both are GHRPs; Hexarelin is more potent but may have more side effects.
Quality checklist
- ✓White to off-white lyophilized powder
- ✓Clear solution after reconstitution
- ✓Intact vacuum seal on vial
- !Slight clumping that dissolves easily
- ×Discolored or yellow powder
- ×Cloudy solution after reconstitution
- ×Particles or precipitates in solution
What to expect
Safety
- Increased appetite (less than GHRP-6)
- Water retention
- Tingling or numbness
- Tiredness after injection
- Mild headache
- Severe or persistent headaches
- Unusual swelling
- Signs of carpal tunnel syndrome
- Allergic reactions
- Active cancer or history of cancer
- Pregnancy or breastfeeding
- Pituitary disorders
- WADA prohibited for competitive athletes
FAQ
Does hexarelin work better when combined with GHRH?
Yes. Hexarelin demonstrates synergistic effects with GHRH peptides like CJC-1295, producing GH responses greater than the sum of either peptide alone. This synergy is well-documented in research and is why the combination is popular among users seeking maximum GH elevation.
How long do the effects of hexarelin last?
Hexarelin has a half-life of approximately 75 minutes to 2 hours. This means you'll see a GH spike within 15-30 minutes of injection, peaking around 30-60 minutes, then returning toward baseline. Multiple daily injections are needed to maintain elevated GH levels throughout the day.
Does hexarelin cause the same appetite stimulation as GHRP-6?
No. Hexarelin is significantly more potent for GH release while causing less appetite stimulation than GHRP-6. This makes it preferable if you want strong GH effects without the intense hunger that GHRP-6 typically triggers.
Can I take hexarelin on an empty stomach?
Yes, and you should. Hexarelin is most effective when injected on an empty stomach, ideally 30-60 minutes before eating. Food can interfere with GH release by elevating insulin levels and suppressing ghrelin signaling.