Hexarelin
Human ResearchHexarelin
One of the most potent synthetic GHRP compounds. Researched for GH release, muscle growth, and notably for cardioprotective effects.
Dose
100-200 mcg
Route
SubQ injection
Cycle
Commonly discussed in research for 8-12 weeks
Storage
Refrigerated (2-8°C) away from light
What is Hexarelin?
Hexarelin is a synthetic hexapeptide that acts as a potent secretagogue of growth hormone (GH), stimulating its release from the anterior pituitary gland. It functions by activating the growth hormone secretagogue receptor (GHSR-1a), also known as the ghrelin receptor. Beyond its robust GH-releasing properties, research highlights its direct cardioprotective effects, which appear to be independent of GH release and are mediated through its binding to the CD36 receptor in cardiac tissue. This makes Hexarelin a subject of interest not only for its anabolic potential but also for its implications in cardiovascular health, particularly in scenarios following cardiac injury. It is one of the most potent synthetic GHRP compounds studied.
Key Benefits
- Powerful GH release
- Muscle growth support
- Cardioprotection
- Fat reduction
- Post-heart attack research
Mechanism of Action
- Potent GHRP-receptor agonist
- Stimulates GH release
- Binds CD36 receptor in heart for cardioprotection
Best For
- Advanced GH research
- Cardiovascular research
- Body composition
Body Systems

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Molecular Information
Molecular weight
872.03 g/mol
Length
6 amino acids
Type
Synthetic Growth Hormone Releasing Peptide (GHRP)
Amino acid sequence
His-D-2-Methyl-Trp-Ala-Trp-D-Phe-Lys-NH2
H-His-D-2-MeTrp-Ala-Trp-D-Phe-Lys-NH2. The D-amino acids enhance resistance to enzymatic degradation.
Pharmacokinetics
Time to peak
15-30 minutes
Half-life
2 h
Time to clear
Approximately 10-12 hours
Various pharmacological studies on GHRPs
Research Indications
Potent GH Release
Hexarelin is recognized as one of the most potent synthetic GHRPs, effectively stimulating the pulsatile release of growth hormone from the pituitary gland through GHSR-1a activation.
Mechanism of Action
Acts as a ghrelin mimetic, binding to the ghrelin receptor to stimulate GH release, often more potently than endogenous ghrelin.
Research Protocols
| Goal | Dose | Frequency | Route |
|---|---|---|---|
| General GH Release and Body Composition | 100-200 mcg | 2-3 times daily | Subcutaneous injection |
| Maximizing Pulsatile GH Release | 100 mcg | 3 times daily, spaced evenly (e.g., morning, afternoon, before bed) | Subcutaneous injection |
| Cardioprotective Studies | Variable, often 200 mcg | 1-2 times daily | Subcutaneous injection |
| Initial Assessment of GH Response | 50-100 mcg | Single dose or once daily | Subcutaneous injection |
| Combination Protocols for Enhanced GH/IGF-1 Axis | 100 mcg | 2 times daily (often combined with a GHRH analog) | Subcutaneous injection |
Timing protocols often attempt to maximize the pulsatile release of GH and minimize potential desensitization of the GHRP receptors.
Peptide Interactions
- Synergistic
CJC-1295 / Mod GRF 1-29 (GHRH analogs)
Combining Hexarelin with GHRH analogs (like CJC-1295 or Mod GRF 1-29) is commonly discussed in research for a synergistic increase in GH release, as they act via different mechanisms to stimulate the pituitary.
- Avoid
Somatostatin (Growth Hormone Inhibiting Hormone)
Somatostatin inhibits GH release. Hexarelin works to counteract this inhibition, but direct interaction or co-administration is not a standard research protocol as it would nullify Hexarelin's primary action.
- Monitor Combination
Exogenous Growth Hormone
While not directly counterproductive, administering exogenous GH alongside a GHRP like Hexarelin might obscure the interpretation of the GHRP's specific effects on endogenous GH secretion and feedback loops.
- Use Caution
Insulin
GH can have effects on glucose metabolism and insulin sensitivity. While not a direct interaction, individuals with pre-existing metabolic conditions or those also administering insulin should monitor blood glucose levels closely.
- Use Caution
Glucocorticoids (e.g., Dexamethasone)
Glucocorticoids are known to blunt GH secretion. Their co-administration might reduce the effectiveness of Hexarelin in stimulating GH release, requiring careful consideration in research protocols.
How to Reconstitute
- 1Gather Hexarelin vial, bacteriostatic water for injection, and sterile syringes.
- 2Remove the plastic cap from the Hexarelin vial to expose the rubber stopper.
- 3Clean the rubber stopper of the Hexarelin vial and the bacteriostatic water vial with alcohol wipes.
- 4Draw the desired amount of bacteriostatic water (e.g., 1 mL) into a sterile syringe.
- 5Slowly inject the bacteriostatic water into the Hexarelin vial, directing it down the side of the glass to avoid direct impact on the lyophilized powder.
- 6Gently swirl the vial to facilitate dissolution. Do not shake.
Reconstitute with bacteriostatic water for injection. Avoid vigorous shaking to prevent peptide degradation.
What to Expect
- Weeks 1-2: Initial observations may include enhanced sleep quality and increased appetite, consistent with GH-releasing effects.
- Weeks 3-6: Users might begin to note improvements in recovery from physical activity, potentially an increase in lean muscle mass, and reduction in body fat, if combined with appropriate diet and exercise.
- Weeks 7-12: More pronounced changes in body composition, including further muscle growth and fat loss, are commonly discussed in research contexts. Cardioprotective effects are studied over similar or longer durations.
- Post-cycle: A return to baseline GH secretion is expected, with some retention of gains if proper post-protocol measures are considered.
- Consistent usage in research protocols over several weeks is typically needed to observe significant changes.
Side Effects & Safety
| Effect | Frequency | Severity |
|---|---|---|
| Increased cortisol | Common | Mild |
| Increased prolactin | Common | Mild |
| Water retention | Common | Mild |
| Increased appetite | Very Common | Mild |
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Open CalculatorPeptides discussed here are for research purposes only. Nothing on this page is medical advice. Always consult a qualified professional before making health decisions.