Peptide Comparison
AlexamorelinvsIpamorelin
A next-generation growth hormone releaser that converts to hexarelin in your body for enhanced GH, cortisol, and unique aldosterone stimulation.
A uniquely selective growth hormone booster that tells your pituitary to release more GH without messing with your cortisol or other hormones—making it the 'clean' choice among growth hormone peptides.
At a Glance
Quick
comparison
Dose Range
Alexamorelin
2.0–2.0 mcg/kg
Ipamorelin
200–200 mcg
Frequency
Alexamorelin
Multiple times daily
Ipamorelin
Multiple times daily
Administration
Alexamorelin
Subcutaneous injection
Ipamorelin
Subcutaneous injection
Cycle Length
Alexamorelin
4-6 weeks
Ipamorelin
8-12 weeks
Onset Speed
Alexamorelin
Moderate (1-2 weeks)
Ipamorelin
Moderate (1-2 weeks)
Evidence Level
Alexamorelin
Limited human trials
Ipamorelin
Moderate human trials (Phase 1-2)
Efficacy
Benefit
ratings
Growth Hormone Release
Hormone Axis Stimulation
Research & Innovation
GH Selectivity
Recovery Support
Safety Profile
Technical Data
Compound
specifications
Alexamorelin
Molecular Formula
C50H63N13O7
Molecular Weight
958.1 g/mol
Half-Life
Estimated 1-3 hours (rapidly metabolized to hexarelin)
Bioavailability
Active IV and orally; subcutaneous bioavailability expected moderate to good
CAS Number
196808-85-2
Ipamorelin
Molecular Formula
C38H49N9O5
Molecular Weight
711.85 g/mol
Half-Life
2 hours
Bioavailability
High when injected subcutaneously
CAS Number
170851-70-4
Protocols
Dosing
tiers
Alexamorelin
Ipamorelin
Applications
Best
suited for
Alexamorelin
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.
Ipamorelin
Clean GH Boost Seekers
If you want the benefits of increased growth hormone without spiking cortisol or other stress hormones, Ipamorelin is uniquely selective. Unlike GHRP-2 or GHRP-6, it won't raise your cortisol levels even at doses 200 times higher than needed for GH release.
Recovery-Focused Athletes
Ipamorelin shines for athletes who want better recovery between training sessions. The GH boost helps repair muscle tissue faster, and since it doesn't mess with other hormones, you can use it consistently without the rollercoaster effects.
Anti-Aging Enthusiasts
Growth hormone naturally declines as we age, contributing to muscle loss, fat gain, and reduced vitality. Ipamorelin offers a gentle way to restore more youthful GH levels without the risks of actual HGH therapy.
Those Recovering from Steroid Use
Research shows Ipamorelin can help counteract the muscle and bone-weakening effects of glucocorticoid medications. If you've been on steroids for medical reasons, this peptide may help you rebuild what you've lost.
Safety Profile
Side
effects
Alexamorelin
Common
- Increased Hunger
- Water Retention
- Injection Site Reactions
Uncommon
- Cortisol-Related Mood Changes
- Joint or Muscle Aches
Serious
- Allergic Reaction
Ipamorelin
Common
- Mild headache
- Injection site reactions
- Water retention
- Increased appetite
Uncommon
- Tingling in hands or feet
- Joint stiffness
Serious
- Allergic reaction
Research Status
Safety
& evidence
Alexamorelin
Evidence Level
Limited human trials
FDA Status
Research compound
Safety Overview
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.
Contraindications
- xActive malignancy or cancer history (GH stimulation concern)
- xUncontrolled diabetes or severe glucose dysregulation
- xSevere cardiovascular disease or unmanaged hypertension
- xPregnancy or nursing
Ipamorelin
Evidence Level
Moderate human trials (Phase 1-2)
FDA Status
Research compound
Safety Overview
Ipamorelin's main selling point is that it raises growth hormone without raising cortisol or ACTH — two stress hormones that similar peptides do raise. That was shown in pigs, and it held even at doses more than 200 times higher than the amount needed to raise growth hormone [1]. It has not been checked in people. The two published human studies measured ipamorelin and growth hormone only; neither one assayed cortisol, ACTH or prolactin [2][3]. Most of what we know about safety in people comes from a single trial in patients recovering from bowel surgery. 114 people took part: 56 got ipamorelin through an IV for up to seven days, and 58 got a placebo. Most side effects were mild to moderate, and were the kind you would expect after surgery [3]. Serious problems happened at about the same rate in both groups — roughly 1 in 6 either way (17.9% on ipamorelin, 15.5% on placebo). But three things were more common on ipamorelin: low potassium in about 1 in 8 people versus about 1 in 30 on placebo (12.5% vs 3.4%), trouble sleeping in about 1 in 9 versus about 1 in 19 (10.7% vs 5.2%), and high blood sugar at discharge in about 1 in 7 versus about 1 in 12 (14.3% vs 8.6%) [6]. Two people taking ipamorelin died. Both had colon cancer surgery, and in both cases the surgical join in the bowel leaked afterward. Nobody on the placebo died. The FDA says it is unclear whether those deaths had anything to do with ipamorelin — but it pointed to them, along with the potassium and blood sugar differences, when it recommended in October 2024 against letting pharmacies compound ipamorelin [6].
Contraindications
- xActive cancer or history of cancer
- xPregnancy or breastfeeding
- xPituitary disorders or tumors
- xKnown allergy to peptide components
- xChildren and adolescents (growth plates still open)
Decision Guide
Which is
right for you?
Choose Alexamorelin if...
- Maximizing growth hormone release for muscle building
- Cycling with other peptides for synergistic GH stack effects
- Research into next-generation GHS compounds
- Understanding prodrug metabolism in peptide design
Choose Ipamorelin if...
- Muscle recovery and growth
- Anti-aging and vitality
- Body composition improvement
- Sleep quality enhancement