Hexarelin
A powerful synthetic growth hormone secretagogue that tells your pituitary gland to release more growth hormone—plus it has remarkable heart-protective properties that make it stand out from other GH-boosting peptides.
Written by Michael Carroll — Owner, Director of Research · Reviewed by the Peptide Initiative Research Team · Editorial standards
Suggested dose
1.5 mcg/kg – 3 mcg/kg
Compound profile
Hexarelin scientific & efficacy data
Growth Hormone
Peptide profile
Moderate human trials
Hexarelin
1.5-3 mcg/kg (approx. 100-200 mcg); ~100 mcg per injection in practice · Once daily
Molecular formula
C47H58N12O6
- Mol. weight
- 887.04 g/mol
- CAS number
- 140703-51-1
- PubChem
- 6918297
- Developed · 1994
- Romano Deghenghi
Europeptides (Argenteuil, France)
Amino acid sequence
His-D-2-methyl-Trp-Ala-Trp-D-Phe-Lys-NH2GH Release
One of the most potent growth hormone secretagogues available—triggers robust, pulsatile GH release that mimics natural youthful patterns [2][6][8][16][17]
Heart Health
Unique cardioprotective effects through CD36 receptor activation—reduces inflammation and protects heart cells from damage [1][3][5]
Body Composition
Enhances fat oxidation, reduces visceral fat, and supports lean mass retention through optimized growth hormone signaling [2]
Dosing
How much Hexarelin do I take?
1.5 mcg/kg – 3 mcg/kg · single dose in trials; 1-3 times daily in research practice · subcutaneous
1.5 mcg/kg – 3 mcg/kg
Single dose in trials; 1-3 times daily in research practice
Covers all 2 documented dose levels · 2 administration routes · timing · dose-adjustment guidance.
Every documented dose level
| Phase | Dose | Frequency | Route |
|---|---|---|---|
| Acute test or open-ended practice use | 1.5-3 mcg/kg (approx. 100-200 mcg); ~100 mcg per injection in practice | Single dose in trials; 1-3 times daily in research practice | Subcutaneous |
| Acute GH provocation | 1-2 mcg/kg (2 mcg/kg is maximally effective) | Single administration | Intravenous |
Suitability
Is Hexarelin right for me?
Best for growth hormone optimization & body composition improvement
Best for
Growth Hormone Optimization
Hexarelin is one of the most potent GH-releasing peptides available. It triggers strong, natural pulses of growth hormone from your pituitary, mimicking the way your body released GH when you were younger. This makes it ideal for those looking to restore youthful GH levels [6][8][9].
Heart Health Support
Unlike most other GH peptides, Hexarelin has direct cardioprotective effects through its binding to CD36 receptors in the heart. Research shows it can protect heart cells from damage, reduce inflammation, and even help prevent the scarring that occurs after heart injury [1][3][5].
Body Composition Improvement
The robust GH pulses triggered by Hexarelin enhance fat burning while supporting lean muscle. Research in obese models showed it increased lipid oxidation in fat tissue and reduced fat accumulation in the liver—all while improving insulin sensitivity [2].
Athletic Recovery
Growth hormone is essential for tissue repair and recovery. Hexarelin's ability to stimulate strong GH release makes it popular among athletes looking to bounce back faster from training. The improved sleep quality many users report also supports recovery.
Consider alternatives if
Do not use if
Use with caution if
Not sure?
Compare Hexarelin with similar peptides to find the best fit for your goals.
Administration
How do I use Hexarelin?
Subcutaneous injection · Intramuscular injection
Route
Subcutaneous injection (just under the skin)—the easiest and most common method for self-administration
Best sites
Covers reconstitution · step-by-step technique · storage · a sample daily schedule.
Safety
Is Hexarelin safe?
4 common side effects · 2 serious
Hexarelin has been studied in human trials and shows a generally favorable safety profile at research doses.
[6][9] The most common effects relate to its strong GH-releasing action: temporary hunger spikes, [14] mild water retention, [15] and occasional tingling in the hands.
Importantly, research suggests Hexarelin has direct cardioprotective effects that may add a margin of safety for cardiovascular health [1][5].
Hexarelin has more human trial data than many research peptides, including Phase 1-2 studies examining its effects on GH release, heart function, and metabolism. [6][9][10][11][16] However, large-scale Phase 3 trials and FDA approval have not been pursued.
Always work with a healthcare provider when using research compounds.
Less common
These typically resolve with continued use or dose adjustment.
Common side effects · experienced by some users
Increased hunger
Hexarelin activates ghrelin receptors (GHSR-1a), which triggers hunger signals. [14] Many people feel quite hungry within 30-60 minutes of injection.
Management: Plan your injection timing around meals. If dosing in the morning, have breakfast ready for 30-60 minutes later. This effect often diminishes after the first week.
Water retention
Mild fluid retention is normal with GH-releasing peptides. [15] You might notice slightly puffy fingers or ankles, especially in the first week or two.
Management: Stay well-hydrated and moderate sodium intake. This typically resolves as your body adjusts. If it persists or worsens, reduce your dose.
Tingling or numbness (paresthesia)
A pins-and-needles sensation in hands or feet is related to GH's effects on nerves and fluid balance. It's usually mild and temporary.
Management: This often resolves on its own within 1-2 weeks. If it becomes bothersome or persistent, reduce your dose.
Injection site reaction
Some redness, itching, or mild swelling at the injection site is normal and usually fades within a few hours.
Management: Rotate injection sites. Ensure proper injection technique and let alcohol fully dry before injecting.
Stop and seek help if
- Any signs of allergic reaction—stop immediately and seek medical help
- Severe or worsening water retention that doesn't improve with dose reduction
- Persistent numbness or tingling that affects daily activities
- Blood sugar issues that don't stabilize
- Any side effect that significantly impacts your quality of life
- You've completed your planned cycle length
Hexarelin is a research compound, not an FDA-approved medication. Never start, stop, or change your dosing without guidance from a qualified healthcare provider. This information is for educational purposes only—not medical advice.
With other peptides
- Safe:CJC-1295 (no DAC) / Mod GRF 1-29 — Synergistic pairing—the GHRH analog amplifies Hexarelin's GH release. Can be injected together.
- Safe:Ipamorelin — Both are GHRPs. Using together may cause excessive GH release and faster desensitization. Better to choose one or alternate.
- Safe:GHRP-6 — Similar mechanism to Hexarelin. Combining may increase side effects like hunger and water retention without proportional benefits.
- Safe:BPC-157 — Safe to combine. BPC-157 focuses on healing and has different mechanisms. Can complement Hexarelin's recovery benefits.
With medications
- Caution:Insulin — GH affects blood sugar. If you're on insulin, monitor closely and work with your doctor—dosage adjustments may be needed.
- Caution:Diabetes medications — Similar concerns as with insulin. GH can raise blood sugar temporarily. Monitor and consult your physician.
- Safe:Corticosteroids (prednisone, etc.) — High-dose steroids can blunt GH response and affect the benefits of Hexarelin.
- Safe:Thyroid medications — GH and thyroid interact. Usually safe, but monitor thyroid levels if on replacement therapy.
With supplements
- Safe:Arginine — Can support GH release. Safe to take, though Hexarelin is already very potent on its own.
- Safe:GABA — May enhance GH release, especially when taken before bed. Safe to combine.
- Safe:Melatonin — Safe and may support the natural nighttime GH pulse. Good for evening dosing protocols.
- Safe:Creatine — No interaction concerns. Can support the muscle-building benefits of enhanced GH.
Effectiveness
How do I know Hexarelin is working?
Moderate human trials · first signs days 1-7
Evidence level
Moderate human trials
(Phase 1-2)
Regulatory status
Research compound
Onset of effects
Rapid
(hours to days)
How it works
Think of Hexarelin as a master key that unlocks your body's growth hormone release.
It works by mimicking ghrelin (your hunger hormone) and binding to special receptors in your pituitary gland called GHSR-1a. When it connects, it tells your pituitary to release a big burst of growth hormone into your bloodstream.
[6][13] But here's what makes Hexarelin special: it also binds to another receptor called CD36 on your heart cells, which triggers protective pathways that help keep your heart healthy—something most other GH peptides don't do [5].
The deeper mechanism
Hexarelin (His-D-2-methyl-Trp-Ala-Trp-D-Phe-Lys-NH2) [12] is a synthetic hexapeptide growth hormone secretagogue that acts primarily through the growth hormone secretagogue receptor type 1a (GHSR-1a).
Upon binding to GHSR-1a in the anterior pituitary, it activates G-protein coupled signaling cascades involving phospholipase C, IP3 generation, and intracellular calcium mobilization, [13] resulting in growth hormone release.
Unlike ghrelin, Hexarelin is resistant to enzymatic degradation, providing more stable pharmacokinetics. [5][12] Uniquely among GH secretagogues, Hexarelin also binds to CD36 (cluster of differentiation 36), a scavenger receptor expressed in cardiac tissue.
[5] CD36 activation mediates cardioprotective effects independent of GH release, including reduction of oxidative stress, [3] modulation of the autonomic nervous system toward parasympathetic predominance, [1] inhibition of the NF-κB inflammatory pathway, and attenuation of myocardial fibrosis through TGF-β1 suppression.
[1] The GHSR-1a pathway also influences metabolism through enhanced lipolysis in adipose tissue and reduced de novo lipogenesis in the liver, contributing to improved body composition and insulin sensitivity [2].
What to expect
Days 1-7
What you might notice
- Increased hunger 30-60 minutes after injection
- Possible mild water retention (slightly puffy hands or face)
- Better sleep quality, especially with evening dosing
- Mild tingling in hands or feet (this is normal)
- Perhaps some initial fatigue as your body adjusts
What's normal
- Hunger spikes are very common and expected
- Minor fluid retention that may add 1-2 lbs
- Feeling a bit different but not dramatically changed yet
What's next
- Stick with your protocol—it takes time to see results
- Note any side effects to track your response
- Ensure you're injecting on an empty stomach for best results
Weeks 2-4
What you might notice
- Sleep quality improvements becoming more consistent
- Initial side effects (water retention, tingling) often diminish
- Better workout recovery
- Possibly some improvement in skin quality
- More stable energy levels
What's normal
- Hunger effects may decrease as your body adapts
- Water weight stabilizes or decreases
- Subtle but noticeable improvements in how you feel
What's next
- Consider adding a second daily dose if tolerating well
- Stay consistent with timing and empty-stomach dosing
- Track body composition changes, not just scale weight
Weeks 5-8
What you might notice
- More noticeable changes in body composition
- Improved muscle tone and recovery
- Skin and hair quality improvements
- Better exercise performance
- Consistent sleep benefits
What's normal
- Progressive but not dramatic changes
- Feeling established in your routine
- Side effects should be minimal at this point
What's next
- Continue through week 8-12 as planned
- Consider blood work to check IGF-1 levels if desired
- Plan your off-cycle period to maintain receptor sensitivity
Weeks 9-12+
What you might notice
- Peak benefits from your cycle
- Solid improvements in body composition if diet and training are on point
- Some users may notice diminishing effects (desensitization)
- Overall sense of improved vitality and recovery
What's normal
- Some plateau in effects is normal toward end of cycle
- Benefits tend to persist for some time after stopping
- Ready to cycle off and give receptors a break
What's next
- Plan 4-8 weeks off to restore receptor sensitivity
- Maintain your results with good nutrition and training
- Evaluate whether to do another cycle based on your response
Signs it's working
Sleep and Recovery
- Falling asleep more easily
- Deeper, more restorative sleep
- Waking up feeling refreshed
- Faster recovery from workouts
- Less muscle soreness after training
Body Composition
- Gradual reduction in body fat, especially around midsection
- Improved muscle tone and definition
- Clothes fitting differently (looser in waist, tighter in shoulders)
- Better workout pumps
- Increased strength over time
General Well-Being
- More stable energy throughout the day
- Improved skin quality (some users report a 'glow')
- Better mood and mental clarity
- Faster healing from minor injuries
- Improved exercise tolerance
Not seeing results? Common reasons
- Taking with food or too soon after eating—always inject on an empty stomach for optimal GH release
- Inconsistent dosing—GH peptides work best with consistent, regular use
- Poor quality peptide from unreliable source—always verify third-party testing (COAs)
- Desensitization from prolonged use—take a 4-8 week break if effects diminish
- Improper storage degraded the peptide—check if solution is crystal clear before using
- Unrealistic expectations—Hexarelin enhances your body's GH release, but you still need good nutrition and training
Key research
Clinical trials
Hexarelin tested in people
No registered clinical trial of Hexarelin was found in the public registries.
That does not mean nobody has studied it — laboratory and animal work is not registered anywhere. It means no study has been declared in advance where regulators and the public can see it, so there are no stated endpoints and no results anyone is obliged to report.
Questions
Frequently asked about Hexarelin
How is Hexarelin different from other GH-releasing peptides like GHRP-2 or GHRP-6?
Hexarelin is one of the most potent GHRPs for stimulating growth hormone release. [6][8][16][17] What really sets it apart is its unique ability to protect the heart through CD36 receptors—something other GHRPs don't do. [5] It also causes less hunger increase than GHRP-6, though more than Ipamorelin. Think of it as a strong all-rounder with added cardiovascular benefits.
Why do I need to inject on an empty stomach?
Food, especially carbs and fats, triggers insulin release. Insulin and growth hormone kind of compete with each other—when insulin is elevated, your body suppresses GH release. By injecting when you haven't eaten for a few hours, you maximize the GH pulse that Hexarelin triggers. [7] Eating right after injection is fine, but wait at least 30 minutes.
Will Hexarelin make me hungry?
Yes, increased hunger is one of the most common effects, usually hitting about 30-60 minutes after injection. This is because Hexarelin activates the same receptors as ghrelin, your hunger hormone. [14] Most users find this effect decreases after the first week or two. Planning your injection around meal times can help manage this.
How long can I use Hexarelin before taking a break?
Can Hexarelin help with heart health?
Research strongly suggests yes. Multiple studies show Hexarelin protects heart cells from damage, reduces inflammation in heart tissue, and may even help prevent scarring after heart injury. [1][3] These effects happen through the CD36 receptor, which is separate from its GH-releasing effects. [5][10][11] It's one of the few peptides with documented cardioprotective properties.
Should I stack Hexarelin with other peptides?
Hexarelin pairs very well with GHRH analogs like CJC-1295 (without DAC) or Mod GRF 1-29. The combination is synergistic—you get a bigger GH pulse than with either alone. [7][8][16] However, stacking with other GHRPs (like GHRP-2 or GHRP-6) isn't usually recommended as it can increase side effects and speed up desensitization without proportional benefits.
Is Hexarelin FDA approved?
What results can I realistically expect?
With consistent use, good nutrition, and training, most users report improved sleep quality, faster recovery from workouts, and gradual improvements in body composition over 8-12 weeks. You won't transform overnight—think of it as optimizing your body's natural GH production. The heart-protective effects happen behind the scenes and aren't something you'll 'feel' directly.
Further reading
Hexarelin history & related research
History · since 1992
The heart drug that never was—a growth hormone peptide that saved failing hearts, then disappeared.
Examorelin, also known as hexarelin, is a six-amino-acid peptide that changed how scientists think about growth hormone drugs. Developed in Italy in 1992, it was designed to be stronger and more stable than earlier growth hormone-releasing peptides.
Read the full history of HexarelinReady for the protocol?
Every dosing tier, administration route, timing note, and dose-adjustment rule for Hexarelin, on one page.