Peptide profile · Growth Hormone
Alexamorelin
A next-generation growth hormone releaser that converts to hexarelin in your body for enhanced GH, cortisol, and unique aldosterone stimulation.
Written & reviewed by Michael Carroll · Research, Peptide Initiative
Typical dose
2.0 mcg/kg
Half-life
Estimated 1-3 hours (rapidly metabolized to hexarelin)
Bioavailability
Active IV and orally; subcutaneous bioavailability expected moderate to good
Molecular weight
958.1 g/mol
Evidence level
Limited human trials
01 · Compound profile
Scientific & efficacy data
Molecular formula
C50H63N13O7
Primary benefits
Alexamorelin ranks among the most potent GHS compounds for stimulating growth hormone secretion, matching hexarelin's proven efficacy while potentially offering faster initial response due to unique ACTH pathway activation.
Beyond GH, alexamorelin's stronger ACTH release and unique aldosterone elevation provide comprehensive endocrine system stimulation, though this requires careful monitoring of cortisol and sodium balance.
As a cutting-edge GHS with demonstrated prodrug metabolism and novel receptor selectivity, alexamorelin appeals to peptide researchers and advanced users exploring next-generation growth hormone secretagogues.
Europeptides / University of Turin
Amino acid sequence
Ala-His-D-2-methyl-Trp-Ala-Trp-D-Phe-Lys-NH202 · Dosing
How much do I take?
2.0 mcg/kg · single bolus per test session
Intravenous: Delivered straight into a vein through a drip (IV), done by a clinician.
Bioavailability Complete (about 100%) — delivered straight into the bloodstream.
Best time to take
Morning injection on empty stomach 30-60 minutes before food maximizes GH response; second dose in late afternoon if dosing twice daily
With food?
Separate from large meals by at least 30-60 minutes; food delays or blunts response. Light snack acceptable 2+ hours after injection
If stacking
If stacking with GHRH, inject GHRH 5-10 minutes after alexamorelin for synergistic effect. Avoid other GHS compounds on same day
＋ Increase if
- +No noticeable GH response after 5-7 days at starting dose
- +Already using similar compounds and tolerated well
- +Aiming for aggressive muscle-building phase with recovery capacity
－ Decrease if
- −Excessive hunger interferes with daily life
- −ACTH-related side effects (anxiety, mood changes) emerge
- −Water retention becomes problematic
✓ Signs of right dose
- ✓Increased appetite 1-2 hours post-injection
- ✓Noticeable energy lift and improved sleep quality
- ✓Visible muscle pump and recovery improvement within 1-2 weeks
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03 · Suitability
Is this right for me?
Best for maximizing growth hormone release for muscle building & cycling with other peptides for synergistic gh stack effects
Best for
Muscle Builders and Athletes
Alexamorelin's potent GH release makes it ideal for those serious about muscle gains. Its stronger ACTH response compared to hexarelin provides additional recovery benefits, though the cortisol elevation requires monitoring. The oral option is convenient for athletes avoiding injections, though subcutaneous injection remains most practical.
Research-Focused Peptide Users
If you're exploring next-generation GHS compounds, alexamorelin offers a fascinating case study: it's a prodrug that becomes hexarelin in your body, offering a unique window into peptide metabolism. This makes it valuable for understanding how compound modifications affect potency and half-life.
Synergistic Stack Enthusiasts
Alexamorelin shines when stacked with GHRH, creating synergistic GH release that exceeds either alone. It also pairs well with recovery-focused peptides like BPC-157, making it the centerpiece of comprehensive growth protocols.
Consider alternatives if
Do not use if
Use with caution if
Not sure?
Compare Alexamorelin with similar peptides to find the best fit for your goals.
04 · Administration
How do I use it?
Subcutaneous injection · Intravenous (clinical)
Reconstitution — what you need
Example
If vial contains 1 mg alexamorelin and you add 1 mL bacteriostatic water, concentration = 1 mg/mL (1000 mcg/mL). To draw 100 mcg, inject 0.1 mL.
Draw volume (mL) = Desired dose (mcg) ÷ Concentration (mcg/mL). For 150 mcg from 1000 mcg/mL solution: 150 ÷ 1000 = 0.15 mL
Route
Subcutaneous injection preferred for consistent GH response; intravenous only in clinical/research settings
Best sites
Technique
- 01Clean injection site with alcohol swab and let dry 10-15 seconds
- 02Pinch skin at injection site to create small fold
- 03Insert needle at 45-90 degree angle (steeper = more subcutaneous, shallower = easier)
- 04Push plunger slowly to minimize discomfort and ensure proper dispersion
- 05Withdraw needle, release skin, and apply gentle pressure for 5 seconds
Storage · before reconstitution
Lyophilized powder at 2-8°C (refrigerator) in dark, dry location. Protect from light and moisture. Properly sealed vial lasts 1-2 years.
Storage · after reconstitution
Reconstituted solution at 2-8°C with bacteriostatic water. Use within 14-30 days. Discard if cloudy, discolored, or shows particles.
Signs of degradation
Sample daily schedule
05 · Safety
Is it safe?
3 common side effects · 3 serious
Alexamorelin is a research compound with only one small human study (6 subjects), making it much less proven than hexarelin. While it shows promise as a potent GH releaser, the limited human evidence means we don't fully understand long-term effects, optimal dosing in different populations, or rare side effects. Its unique stronger ACTH and aldosterone effects require careful monitoring. Always start low and monitor how your body responds.
This compound has NOT been approved by the FDA and is not available as a pharmaceutical medication. All use is research-based. The single human study was published in 2000 (Eur J Endocrinol), providing our only direct human efficacy data.
Common side effects · experienced by some users
Less common
These typically resolve with continued use or dose adjustment.
Stop and seek help if
- ×Severe mood changes or anxiety that don't improve with dose adjustment
- ×Signs of cardiovascular stress (chest pain, irregular heartbeat, severe headaches)
- ×Uncontrolled blood sugar elevation or worsening of diabetes
- ×Persistent allergic reactions or injection site infections
- ×Completion of planned 4-6 week cycle (take break before restarting)
- ×New or worsening joint problems that limit training
This is research compound information, not medical advice. Consult a healthcare provider before starting, especially if you have existing health conditions. Stop immediately if you experience serious side effects and seek medical attention.
With other peptides
- ✓GHRH — Synergistic GH release; inject GHRH 5-10 minutes after alexamorelin for maximum effect
- !Hexarelin — Redundant since alexamorelin metabolizes to hexarelin; combining offers no additional benefit and increases side effects
- ✓IGF-1 — Complementary for recovery; IGF-1 amplifies growth signaling without competing with alexamorelin's GHS mechanism
- ✓BPC-157 — Synergistic for tissue repair; alexamorelin provides systemic GH while BPC-157 targets local healing
With medications
- !Corticosteroids (prednisone, dexamethasone, etc.) — Alexamorelin already elevates cortisol through ACTH; combining risks excessive cortisol with serious metabolic effects
- !Dopamine antagonists (antipsychotics like haloperidol) — May reduce GH response; dopamine pathways influence GHS effectiveness
- !Somatostatin analogs (octreotide) — Directly block GH secretion, completely negating alexamorelin's mechanism
- !Blood pressure medications — Monitor closely; aldosterone elevation may reduce antihypertensive effectiveness
With supplements
- ✓GHRH-boosting supplements (arginine, ornithine) — Synergistic but additive ACTH response; monitor cortisol effects carefully
- ✓High-dose electrolyte supplements (sodium, potassium) — Aldosterone elevation already increases sodium retention; excess supplementation risks dangerous electrolyte imbalance
- ✓Sleep aids or melatonin — Compatible; actually beneficial since quality sleep amplifies GH response
06 · Effectiveness
How do I know it's working?
Limited human trials · first signs week 1
Evidence level
Limited human trials
How it works
Alexamorelin is a small peptide that tricks your body into releasing more growth hormone by activating the ghrelin receptor in your brain. Think of the ghrelin receptor like a doorbell for growth hormone—when alexamorelin presses it, your pituitary gland cranks out GH. What's clever is that alexamorelin is basically hexarelin with extra stuff attached; once you inject it, your liver chops off the extra piece and you're left with hexarelin anyway, which means you get all the benefits of a proven compound.
Alexamorelin is a heptapeptide (7-amino-acid) GHS that activates GHS-R1a (ghrelin receptor), a G-protein coupled receptor located on somatotroph cells in the anterior pituitary. Receptor activation triggers calcium influx and phospholipase C signaling, causing depolarization and GH secretion. Uniquely, alexamorelin shows more potent ACTH stimulation than hexarelin, indicating enhanced signaling at corticotroph GHS-R1a receptors. It also uniquely increases aldosterone levels, suggesting potential cross-talk with mineralocorticoid pathways or direct adrenal stimulation. The compound's higher potency at ACTH-releasing than its parent hexarelin may result from structural modifications (N-terminal alanine, 2-methyl-D-tryptophan) that alter receptor subtype selectivity or signaling efficacy. Following injection, carboxypeptidase A rapidly cleaves the terminal alanine residue, yielding hexarelin as the primary metabolite within hours. This prodrug relationship explains why alexamorelin's pharmacodynamic profile mirrors hexarelin while potentially offering distinct pathway activation earlier in metabolism.
What to expect
Week 1
What you might notice
- •Increased appetite starting within hours of first injection
- •Mild energy boost or slight euphoria
- •Possible sleep improvement quality
What's normal
- •Slight injection site redness
- •Mild water retention starting day 2-3
- •No dramatic strength gains yet (GH takes time)
What's next
- →Assess tolerance and adjust dose if needed
- →Expect GH response to solidify by day 5-7
- →Monitor mood for any ACTH-related effects
Week 2-3
What you might notice
- •Noticeable strength and endurance improvements in training
- •Better sleep quality and faster recovery from workouts
- •Increased hunger remains consistent
- •Possible subtle changes in body composition
What's normal
- •Continued mild appetite increase
- •Slight water retention (usually manageable)
- •Increased energy and focus
What's next
- →Body adapting well; continue current dose unless issues emerge
- →Notice baseline improvements in recovery before dramatic changes
- →Strength gains accelerate as GH accumulates
Week 4-6
What you might notice
- •Visible improvement in muscle definition and recovery
- •Significant strength increases compared to baseline
- •Noticeably improved body composition
- •Better joint health and reduced injury risk
What's normal
- •Appetite elevation remains stable or slightly decreases
- •Water retention may decrease as body adapts
- •Energy remains high throughout day
What's next
- →As cycle ends (4-6 weeks), plan 4-week break before restarting
- →Document progress to track long-term changes
- →Consider stacking with other compounds for next cycle if desired
Signs it's working · Performance
- ✓Increased bench press, squat, or deadlift maxes by 10-15 lbs within 3-4 weeks
- ✓Ability to perform extra reps at same weight
- ✓Improved workout endurance and reduced mid-set fatigue
Signs it's working · Recovery
- ✓Reduced muscle soreness 24-48 hours after training
- ✓Faster recovery between intense sessions
- ✓Ability to train hard 6-7 days weekly without overtraining
Signs it's working · Body Composition
- ✓Leaner appearance despite no diet change
- ✓Increased muscle definition, especially in abs and shoulders
- ✓Visual circumference increase in arms, legs, or chest
Not seeing results? Common reasons
- •No GH response or weak response: Check injection technique (may not be truly subcutaneous), verify reconstitution accuracy, ensure adequate sleep and nutrition to support response, or consider dose too low
- •Excessive side effects early: Dose likely too high for your sensitivity; reduce to 50-100 mcg and titrate up slowly over 1-2 weeks
- •Cortisol-related anxiety or mood: Unique stronger ACTH effect of alexamorelin vs hexarelin; lower dose, reduce frequency, or switch to hexarelin if side effect persists
- •Minimal strength gains despite good GH response: Often training or nutrition limitation, not compound failure; increase protein to 0.8-1g per lb bodyweight and ensure progressive overload in workouts
- •Water retention too severe: Usually from combined effect of GH (sodium retention) and aldosterone (enhanced by alexamorelin); reduce sodium intake and ensure adequate potassium, or lower dose
- •Injection site swelling or inflammation: Poor sterile technique or sensitivity to peptide; improve injection hygiene, rotate sites more frequently, or apply ice after injection
Key research
07 · Questions
Frequently asked
How is alexamorelin different from hexarelin?+
Alexamorelin has an extra alanine amino acid on the front and a 2-methyl modification that makes it slightly different structurally. The key difference in your body is that alexamorelin releases stronger ACTH and uniquely increases aldosterone, which hexarelin doesn't do. However, your liver converts alexamorelin to hexarelin within 1-3 hours, so it's basically like taking a modified hexarelin that hits harder initially.
Why is there only one human study if this was developed in 1998?+
Alexamorelin was developed as a research compound, not a pharmaceutical medication designed for market approval. The single 2000 study was sufficient to show it works in humans and compare it to hexarelin, but without FDA funding or commercial interest, further studies never happened. This is why it remains research-only despite being over 25 years old.
Can I take alexamorelin orally instead of injecting?+
Yes! The research study showed that a 20mg oral dose produced GH release comparable to IV doses. Oral bioavailability is active, though typically less convenient and potentially less consistent than subcutaneous injection. Oral form is harder to find but is being explored.
What should I do if I experience anxiety or mood changes?+
Alexamorelin's stronger ACTH response compared to hexarelin can trigger anxiety or mood elevation in sensitive people. Try reducing your dose by half, cutting back to once daily, or switching to hexarelin if the side effect persists. Monitor yourself during the first week especially, and talk to a healthcare provider if changes are severe.
How long should I cycle alexamorelin, and do I need to take breaks?+
Research and standard GHS practice suggests 4-6 week cycles followed by 4-week breaks. This prevents receptor downregulation (where your body becomes less responsive) and allows hormonal systems to reset. Most experienced users follow a 4 weeks on, 4 weeks off pattern indefinitely.
Will alexamorelin make me gain fat?+
Alexamorelin itself doesn't directly increase fat storage, but it does increase appetite and aldosterone (which causes water retention). If you eat excess calories, yes, you'll gain fat alongside muscle. To minimize fat gain, keep calories at or slightly above maintenance, prioritize protein, and maintain consistent training intensity.
08 · Further reading
History & related research
History · since 2000
One amino acid changed everything. How adding a single building block revealed the hidden complexity of growth hormone signals.
Alexamorelin is a seven-amino-acid peptide created by adding a single building block to the front of hexarelin. Though alexamorelin matches hexarelin's ability to trigger growth hormone release, it triggers stress hormones far more powerfully.
Read the full history of Alexamorelin