Ipamorelin
Bumps your natural growth-hormone pulses without hitting cortisol or prolactin. A selective GH secretagogue.
Ipamorelin: Bumps your natural growth-hormone pulses without hitting cortisol or prolactin. A selective GH secretagogue. Ipamorelin gently nudges your body to release more of its own growth hormone, without the side effect baggage of injecting actual HGH.
Ipamorelin gently nudges your body to release more of its own growth hormone, without the side effect baggage of injecting actual HGH. People run it for sleep, recovery, and slow body-comp shifts. Tiny doses, multiple times a day.
Its nomination was withdrawn in 2024, and when FDA's advisory committee reviewed it in October 2024 the committee voted against including it. It is not on the 503A list and is not scheduled for another review.
Some anti-aging and longevity clinics prescribe via compounding pharmacies, off-label.
Who it's for
- →Users wanting GH benefits without the bloat / sides of HGH
- →Sleep / recovery focused stacks
- →Beginners to GH-class peptides
What to expect
- Week 1
Deeper sleep within the first few nights.
- Week 4
Recovery improvement noticeable. Skin/hair starts looking better.
- Week 8
Cumulative effect on body composition for users in a clean diet.
Looking at Ipamorelin? Your next 3 steps
- 1Work out your syringe units
Vial size + BAC water turns into the exact units to draw for Ipamorelin.
Open calculator → - 2See what to stack & monitor
The companion supplements and the bloodwork worth tracking on this kind of protocol.
Bloodwork guide → - 3Save it & ask the Coach
A free account gets you Coach questions every day, free; membership saves your stack and makes the Coach stack-aware.
Create free account →
How it works (mechanism)
Selective ghrelin/GHS-R1a agonist that triggers a clean GH pulse from the pituitary without elevating cortisol, prolactin, or aldosterone. Cleanest of the GH secretagogues for that reason.
Dosing protocol
Stacks well with
Stack essentials
Side effects
When NOT to use
- ⚠Active malignancy
- ⚠Pregnancy / nursing
Bloodwork to monitor
- • IGF-1 baseline + at week 8
Common mistakes
- • Eating within 30 min of injection (food blunts the GH pulse)
- • Skipping the pre-bed dose
- • Not cycling off
What it actually is
Ipamorelin is a short synthetic peptide that tells your pituitary to release a pulse of your own growth hormone. It was designed to be selective: unlike the older growth hormone secretagogues it triggers that pulse with very little effect on cortisol or prolactin, which is the entire reason it became the popular one. It has never been approved for anything, and the human data behind it is thin.
It activates the ghrelin receptor on pituitary cells, the same receptor an empty stomach uses to signal hunger and trigger growth hormone release. Ipamorelin hits it selectively enough that you get the growth hormone pulse without much of the cortisol and prolactin rise the earlier compounds in this class caused. Because it works through your own pituitary, release depends on what the pituitary will produce rather than on how much you inject. That is often described as a safety advantage over injecting growth hormone, and no comparative trial has established it — a single episodic response was documented after intravenous infusion, which is not the same as demonstrated long-term pulsatility or protection from excess.
Forms, and which is which
Reconstituted by the buyer. There is no approved product, so identity and sterility are the seller's claim.
Verdict: The only form, with the quality risk that implies.
Pairs a ghrelin-receptor agonist with a GHRH analog, two different signals onto the same pulse. The rationale is real pharmacology; the combined human evidence is not.
Verdict: Coherent theory, no controlled human data for the combination.
Peptides degrade faster in solution than as powder, and you cannot see degradation. Removes the buyer's only inspection point.
Verdict: Convenience at the cost of your one quality check.
No reliable absorption or efficacy data exists for either route, so the delivered dose is unknown.
Verdict: Sold, and unsupported by any pharmacokinetic evidence.
What it is claimed to do, graded
The 1998 characterisation paper demonstrated the cortisol and prolactin sparing in rats and swine, not in people. Human intravenous data shows the growth hormone pulse; the selectivity claim rests on the animal work.
There is no completed human trial demonstrating fat loss or lean mass gain from ipamorelin. Two human trial records are indexed for the compound in total.
Widely reported by users and plausible given growth hormone's relationship with slow-wave sleep. Untested for this compound.
The reason many people run it. Recent orthopaedic reviews list it among unapproved peptides used in sports medicine specifically because the evidence is absent.
Demonstrated in rats in 1999. No human equivalent.
Grades describe how much human evidence exists for that specific claim, not whether it will work for you or whether it is safe.
Pros and cons
- • Genuinely selective — the low cortisol and prolactin effect is a real, demonstrated property, not marketing
- • Works through your own pituitary, so release stays pulsatile and self-limiting
- • Human intravenous half-life is about two hours, with growth hormone levels low again by around six; subcutaneous pharmacokinetics are not established
- • No serious harms are commonly reported, though there is no systematic safety dataset
- • Only two indexed human-trial records, and none testing the outcomes people take it for
- • Never approved anywhere
- • Everything sold is research-chemical supply with unverified identity — FDA has specifically raised peptide aggregation, impurities, endotoxin control and immunogenicity as risks for compounded injectable peptides, including severe hypersensitivity reactions
- • The effect is limited by what your own pituitary will release
- • Banned in sport as a growth hormone secretagogue
When to stop
- • Fasting glucose drifting upward across cycles
- • Persistent numbness or tingling in the hands
- • Swelling that does not settle
- • Any new cancer diagnosis — growth signalling is the concern
- • You are drug-tested in sport
Interactions
Adding a secretagogue to exogenous growth hormone stacks the insulin-resistance and fluid-retention risks for no established gain.
Not a drug interaction but the practical one: elevated blood glucose and insulin blunt the growth hormone pulse, which is why doses are taken away from meals.
Both act on the ghrelin receptor. Redundant mechanism, additive appetite and insulin-resistance effects.
Steroids blunt the growth hormone response, so the pulse ipamorelin produces will be smaller.
Growth hormone opposes insulin. Anyone managing blood sugar should be watching it.
Is this for you?
- • People who want GH-axis effects with the mildest reported side-effect profile in the class
- • Anyone who will run baseline and week-8 IGF-1 to see whether it is doing anything at all
- • You have active cancer
- • You are pregnant or nursing
- • You are drug-tested in sport
- • You expect it to do what growth hormone does — the evidence for that does not exist
The one number
Sources for the claims above
- First selective growth hormone secretagogue, characterisation
- Induces longitudinal bone growth in rats
- Listed among unapproved peptide therapies used for musculoskeletal injury
Drug & supplement interactions
- ⚠Eating within 30 minutes of dose blunts the GH pulse
- ⚠Limited documented drug interactions, but always disclose to provider
The Pepdex take
The cleanest secretagogue in the family, minimal side effect surface, gentle pulse, doesn't crank cortisol or prolactin like GHRP-2 or Hexarelin do. Best 'is GH-axis work for me?' compound to run solo for one cycle before stacking. Once you know it works for you, pair with CJC-1295 (no-DAC) and forget about it.
Community patterns
New to Ipamorelin? Grab the starter checklist.
Drop your email and we'll send the one-page starter checklist beginners actually need first. No account needed.
No spam, and we never sell your email. Just the checklist. Email support@pepdex.co to opt out any time.
Numbers redacted in this preview. Members get the full answer, on their own stack.
Ask the Coach anything about Ipamorelin or your own stack. This is it working.
Trained only on Pepdex content. Does the dose math, flags interactions, knows your stack. Won't push vendors, won't pretend to be a doctor.
Unlock the full Coach, from $4.99/week →Frequently asked
What is Ipamorelin?+
Is Ipamorelin FDA approved?+
Is Ipamorelin legal?+
Is Ipamorelin banned by WADA?+
Are you still natty after taking Ipamorelin?+
Do doctors prescribe Ipamorelin?+
What's the typical dose of Ipamorelin?+
What are the side effects of Ipamorelin?+
How long until Ipamorelin starts working?+
What can you stack with Ipamorelin?+
Where do people get Ipamorelin?+
Ipamorelin vs CJC-1295 (no DAC), which is better?+
Ipamorelin vs MK-677 (Ibutamoren), which is better?+
Ipamorelin vs Tesamorelin, which is better?+
Common questions about Ipamorelin
Tracked alongside Ipamorelin
Same goal, different aisle — each graded on its own evidence in the Pepdex catalog.
More in GH-axis
Recombinant human growth hormone, the protein itself, not a peptide that nudges your body to make more. Highest legal-risk compound in this catalog.
Oral ghrelin mimetic. Bumps GH and IGF-1 without injections. Strong appetite stimulation is the trade-off.
Pairs with Ipamorelin to amplify your natural growth-hormone pulses. A GHRH analog whose 'no-DAC' version stays short-acting on purpose.
Used to drive muscle growth. A long-acting form of insulin-like growth factor 1, with limited human safety data and a real side effect profile, handle with discipline.