Ipamorelin: Clean GH Secretagogue Guide

Growth hormone secretagogues come in two flavors: GHRP (GH-releasing peptides) and GHRH (GH-releasing hormones). Ipamorelin is the cleanest GHRP available. It triggers GH release from your pituitary without spiking cortisol, prolactin, or appetite. That selectivity is why it became the most popular GH peptide for research and practical use.

How ipamorelin works

Ipamorelin is a pentapeptide (5 amino acids) that binds to ghrelin receptors (GHS-R1a) on pituitary somatotroph cells. When it binds, the pituitary releases a pulse of growth hormone into the bloodstream.

But here's what sets ipamorelin apart from older GHRPs like GHRP-6 or GHRP-2: it's highly selective. In a 1998 study (Raun et al., Endocrinology), ipamorelin produced GH release comparable to GHRP-6 but without the cortisol increase, without the prolactin spike, and without the intense hunger that makes GHRP-6 miserable to use.

This selectivity means cleaner GH pulses. No stress hormone interference. No appetite disruption. Just growth hormone.

What elevated GH actually does

GH pulses from ipamorelin trigger your liver to produce IGF-1 (insulin-like growth factor 1). IGF-1 mediates most of GH's beneficial effects:

• Improved body composition (less fat, more lean mass over time)
• Better recovery between training sessions
• Enhanced collagen synthesis (joints, tendons, skin)
• Improved sleep quality (GH naturally peaks during deep sleep, ipamorelin amplifies this)

A 2009 study in healthy volunteers showed that ipamorelin dosed at 1mcg/kg produced a 5-fold increase in GH levels within 30-40 minutes, returning to baseline within 3 hours. Clean pulse, predictable timing.

Dosing

Standard research protocol: 200-300mcg subcutaneously, 2-3 times per day. Timing matters: best results come from dosing on an empty stomach (fasting for 2+ hours), because carbs and fats blunt GH release.

Common timing schedule: morning (fasted), post-workout, and before bed. The pre-bed dose synergizes with natural nighttime GH secretion.

[[Ipamorelin|17]] is available in vial format. Reconstitute with bacteriostatic water. Course length: 8-12 weeks, followed by 4 weeks off to avoid receptor desensitization.

Stacking with GHRH

Ipamorelin works even better when combined with a GHRH peptide like [[Tesamorelin|18]]. The logic: GHRH tells the pituitary "make more GH," while ipamorelin tells it "release what you've made." Together they produce a bigger GH pulse than either compound alone. This GHRP + GHRH stack is the gold standard protocol in GH peptide research.

Side effects

Head rush or light tingling in the first few minutes after injection (common, harmless, related to the GH pulse). Mild water retention in some people during the first 1-2 weeks. Occasional headache.

Notably absent: no cortisol increase, no prolactin increase, no extreme hunger. This is specifically why people choose ipamorelin over GHRP-6 or GHRP-2.

Who this is for

If you want to optimize natural GH secretion without the side effects of full exogenous GH. If recovery, body composition, sleep, and collagen health matter to you. If you want a peptide you can run for 8-12 week cycles with predictable effects.

Check out [[Ipamorelin|17]]. For help with stacking or dosing schedules, reach out to us.

This article is for educational purposes. Peptides are intended for research use. Consult a healthcare professional before starting any protocol.