Disclaimer: This guide is educational content for informational purposes only and does not constitute medical advice. Hexarelin is not approved for therapeutic use in most jurisdictions, including the United States, and exists in a regulatory gray area as a research peptide. Consult a qualified healthcare provider before use. This content is not intended for individuals with hormone-sensitive conditions, diabetes, or active malignancy.
Hexarelin is a synthetic hexapeptide growth hormone secretagogue that stimulates endogenous GH release through potent agonism at the growth hormone secretagogue receptor (GHSR-1a). Unlike other GH-releasing compounds, hexarelin also binds to CD36 scavenger receptors, contributing to unique cardioprotective properties. The result is robust GH pulse release, elevated IGF-1 levels, and downstream anabolic signaling.
Because hexarelin acts through the body's natural GH pathway rather than replacing GH directly, dosing is measured in micrograms (mcg) per injection, with effects typically peaking within 15–30 minutes of administration. Dosing ranges are narrow and evidence-based, making precision critical for safety and efficacy.
The evidence-supported dosing range for hexarelin is 100–200 mcg per injection, administered once to twice daily via subcutaneous or intramuscular injection.
Typical dosing breakdown:
- Low end: 100 mcg once daily (~$40–$50/month)
- Standard: 100–150 mcg once to twice daily (~$60–$85/month)
- Higher end: 150–200 mcg twice daily (~$85–$110/month)
This range reflects human clinical trial data showing dose-dependent GH responses, with minimal additional benefit beyond 200 mcg per dose and increasing side effect risk at higher frequencies.
Research in human volunteers demonstrates that:
- 0.48 µg/kg (approximately 34–48 mcg for a 70–100 kg individual) produces the ED50 (half-maximal effective dose) for GH release
- 140 mU/L GH plateau is reached at doses around 100–140 mcg in most individuals
- Prolactin and cortisol elevation follow parallel dose-response curves, with meaningful elevation beginning at 0.5 µg/kg (approximately 35–50 mcg)
The 100–200 mcg range balances robust GH stimulation against transient but dose-dependent increases in cortisol and prolactin, which are the primary safety concerns with repeated dosing.
Hexarelin is primarily investigated for cardioprotective, anabolic, and GH-deficiency applications. Dosing should be tailored to your primary objective:
Recommended dose: 100–150 mcg once daily
Human clinical trials demonstrate acute improvements in left ventricular ejection fraction (LVEF) and cardiac output at single doses of 2.0 µg/kg IV (approximately 140–200 mcg), with effects lasting up to 90 minutes. For chronic cardioprotective benefit (based on animal models), once-daily dosing in the 100–150 mcg range provides consistent GH elevation and CD36 receptor activation without excessive cortisol accumulation.
Timing: Administer in the morning to align with natural GH pulse physiology and minimize sleep disruption.
Recommended dose: 100–200 mcg once to twice daily
While direct human evidence for muscle hypertrophy is absent, hexarelin's GH-stimulating effect and documented mitochondrial protection in animal cachexia models suggest benefit for muscle preservation and metabolic health. Twice-daily dosing maximizes IGF-1 elevation and provides two daily GH pulses, mimicking physiologic rhythms.
Timing: First injection upon waking; second injection 6–8 hours later (afternoon). Avoid dosing within 2 hours of bedtime to prevent sleep disruption from elevated cortisol.
Recommended dose: 100–150 mcg once to twice daily
Animal models show hexarelin improves glucose tolerance and reduces hepatic triglycerides despite increased appetite. The mechanism involves GH-mediated metabolic remodeling and mitochondrial biogenesis. Once-daily dosing is sufficient for metabolic signaling; twice-daily dosing may accelerate results but increases hormone perturbation.
Timing: Administer in the morning, before meals, to align with natural cortisol rhythm and minimize appetite amplification.
Recommended dose: 100–150 mcg once daily
Research in elderly subjects (age 66–81) shows hexarelin maintains dose-dependent GH response even in populations with age-related GH decline. A single morning dose replicates physiologic pulsatile secretion better than constant supplementation.
Timing: 30–60 minutes after waking, before breakfast, for consistent GH triggering.
Hexarelin is administered via subcutaneous (SC) or intramuscular (IM) injection only. Oral formulations have no bioavailability; intravenous use is restricted to clinical settings.
Subcutaneous injection (preferred for self-administration):
- Use a 29–31 gauge insulin syringe
- Inject into the abdomen (2 inches from navel), thigh, or upper arm
- Rotate injection sites daily to prevent lipohypertrophy
- Administer at a 90-degree angle; pinch skin if necessary
- Volume per injection: 0.1–0.5 mL (depending on concentration)
Intramuscular injection:
- Use a 25–27 gauge needle
- Inject into the deltoid, vastus lateralis, or gluteus maxhaximius
- Rotate sites to prevent tissue damage and abscess formation
Hexarelin is typically supplied as a lyophilized (freeze-dried) powder requiring reconstitution:
- Use bacteriostatic water (0.9% sodium chloride with 0.9% benzyl alcohol) as diluent
- Inject diluent slowly into the vial to avoid foaming
- Gently swirl (do not shake) to dissolve fully
- Store reconstituted hexarelin at 2–8°C (refrigerated); stable for 14–30 days depending on diluent
- Draw doses into clean insulin syringes immediately before injection
Dosing calculation example:
- If your vial contains 2 mg hexarelin and you reconstitute with 2 mL bacteriostatic water, the concentration is 1 mg/mL (1000 mcg/mL)
- To draw 100 mcg, pull back 0.1 mL (100 units on an insulin syringe)
- To draw 200 mcg, pull back 0.2 mL (200 units)
Hexarelin's effectiveness depends on aligning injections with circadian GH rhythms and minimizing sleep disruption:
Single daily dose:
- Inject upon waking (6–8 AM)
- GH peaks within 15–30 minutes and returns to baseline within 60–90 minutes
- Allows full recovery before bedtime
Twice-daily dosing:
- First injection: 6–8 AM (upon waking)
- Second injection: 2–4 PM (6–8 hours later, before cortisol naturally rises in evening)
- Avoids dosing within 3 hours of sleep
- Maintains elevated GH and IGF-1 throughout waking hours
Research does not support continuous daily use without breaks. Cycling strategies based on GH physiology and side effect management:
Continuous protocol (8–12 weeks on, 1–2 weeks off):
- Use hexarelin daily for 8–12 weeks at your target dose
- Take 1–2 weeks off to allow pituitary sensitivity recovery and reduce cortisol/prolactin cumulation
- Repeat cycle
- Best for: sustained anabolic goals, cardioprotection, metabolic remodeling
Intermittent protocol (5 days on, 2 days off):
- Inject hexarelin Monday–Friday
- Rest Saturday–Sunday
- Reduces cumulative prolactin and cortisol elevation while maintaining weekly GH stimulus
- Better for: minimizing side effects, long-term tolerance
- Note: Intermittent protocols lack direct human evidence but are theoretically advantageous
Pulse protocol (3 days on, 4 days off):
- Inject Monday, Tuesday, Wednesday; rest Thursday–Sunday
- Minimizes hormonal perturbation while maintaining pulsatile GH signaling
- Suitable for: individuals sensitive to cortisol elevation or prolactin side effects
- Off-season (winter/rest months): 100 mcg once daily, 5 days per week
- Competition or high-demand periods: 100–150 mcg twice daily, 8–12 week blocks
- Recovery from injury: 100–150 mcg daily (continuous for 8–12 weeks, then cycle off)
Goal: Assess tolerance and establish baseline GH response
- Starting dose: 100 mcg once daily (morning only)
- Duration: 4 weeks
- Frequency: 5–6 days per week (allow 1–2 rest days)
- Cost: ~$40–$50/month
- Expected outcome: Improved sleep quality, mild appetite increase, detectable GH elevation on bloodwork
Why start low: Allows assessment of individual side effect sensitivity (cortisol elevation, prolactin, water retention) before escalating. Many individuals experience maximal GH response at 100 mcg once daily.
Progression: After 4 weeks, if well-tolerated and goals warrant, increase to 100–150 mcg twice daily (morning + afternoon). Do not exceed 200 mcg per single dose.
Goal: Maximize anabolic and cardioprotective signaling with managed side effects
- Dose: 150–200 mcg once to twice daily
- Duration: 10–12 week blocks with 1–2 week breaks
- Frequency: Twice daily (morning + afternoon)
- Cost: ~$85–$110/month
- Expected outcome: Robust GH/IGF-1 elevation, measurable lean mass retention, improved cardiac function markers, pronounced appetite increase
Monitoring required: Advanced users should track:
- Prolactin and cortisol levels every 4–6 weeks
- Fasting glucose and insulin sensitivity (monthly)
- Blood pressure (weekly)
- Water retention and edema (daily subjective assessment)
When to adjust: If prolactin exceeds 24 ng/mL (females) or 17 ng/mL (males), or cortisol remains elevated at 8 AM, reduce dose or frequency. If carpal tunnel symptoms develop, reduce to once-daily dosing or implement the intermittent 5-on/2-off protocol.
Problem: Doses above 200 mcg produce marginal additional GH stimulus but significantly amplify prolactin and cortisol elevation, water retention, and carpal tunnel risk.
Fix: Stay within 100–200 mcg per injection. If GH response is inadequate at 200 mcg, consider increasing frequency (e.g., from once to twice daily) rather than dose size.
Problem: Hexarelin raises cortisol and can suppress sleep quality. Late-afternoon or evening injections disrupt sleep architecture and elevate nocturnal cortisol, reducing recovery.
Fix: Complete all daily hexarelin injections by 4 PM. Single daily users should inject within 1 hour of waking.
Problem: Chronic daily hexarelin use leads to pituitary desensitization, cumulative cortisol and prolactin elevation, and potential development of prolactin-related side effects (gynecomastia, sexual dysfunction).
Fix: Implement an 8–12 week on, 1–2 week off cycle. Alternatively, use the 5-on/2-off or 3-on/4-off protocol to reduce cumulative hormone load.
Problem: Highly variable injection times day-to-day disrupt circadian GH pulsing and make it difficult to assess tolerance or efficacy.
Fix: Inject at the same time each day (ideally 6–8 AM for morning dose, 2–4 PM for second dose). This consistency optimizes physiologic GH secretion and allows accurate tracking of side effects.
Problem: Improper reconstitution (vigorous shaking, wrong diluent) or storage (room temperature, exposed to light) degrades hexarelin peptide structure, reducing potency by 20–40%.
Fix: Always reconstitute with bacteriostatic water only. Gently swirl, do not shake. Store reconstituted product at 2–8°C. Use within the manufacturer's recommended window (typically 14–30 days). Discard if the solution turns cloudy or discolored.
Problem: Beginning at 150–200 mcg without assessing tolerance causes unnecessary side effects (water retention, cortisol elevation, appetite dysregulation) that may persist or worsen.
Fix: Always begin at 100 mcg once daily for 2–4 weeks before escalating. This "start low, go slow" approach identifies individual sensitivity and allows side effect management.
| Use Case | Dose | Frequency | Timing | Cycle | Est. Cost/Month |
|---|
| Beginner (tolerance assessment) | 100 mcg | Once daily | Morning | 4 weeks, 5–6 days/week | $40–$50 |
| Cardiac health | 100–150 mcg | Once daily | Morning | 8–12 weeks on, 1–2 off | $50–$75 |
| Lean mass & anabolic | 100–200 mcg | 1–2× daily | AM + afternoon | 10–12 weeks on, 1–2 off | $75–$110 |
| Metabolic/glucose control | 100–150 mcg | 1–2× daily | AM ± afternoon | 8–12 weeks on, 1–2 off | $60–$85 |
| GH deficiency | 100–150 mcg | Once daily | Morning | Continuous with breaks | $50–$75 |
| Advanced (experienced users) | 150–200 mcg | 2× daily | AM + afternoon | 10–12 weeks on, 2 off | $85–$110 |
| Minimum effective | 100 mcg | Once daily | Morning | Any | $40–$50 |
| Maximum safe | 200 mcg | 2× daily | AM + afternoon | With mandatory breaks | $100–$110 |
- Effective range: 100–200 mcg per injection is supported by human research; stay within this window.
- Timing matters: Morning injections optimize GH signaling; avoid doses within 3 hours of sleep.
- Cycling prevents desensitization: Use 8–12 week on/1–2 week off cycles or intermittent 5-on/2-off protocols.
- Start conservatively: Begin at 100 mcg once daily and assess tolerance before increasing frequency or dose.
- Monitor prolactin & cortisol: Regular bloodwork (every 4–6 weeks) is essential for long-term safety, especially with twice-daily dosing.
- Cost is predictable: Expect $40–$110/month depending on dose and frequency; plan accordingly.
- Not for everyone: Individuals with hormone-sensitive conditions, diabetes, or active malignancy should not use hexarelin.
Hexarelin's narrow, evidence-supported dosing range makes it a relatively forgiving compound when used responsibly. Precision, consistency, and cycling discipline are the hallmarks of safe and effective hexarelin use.