If you're researching GH secretagogues and trying to decide between the GHRPs, ipamorelin comes up as the recommended starting point almost universally. Here's why.
What makes ipamorelin different from other GHRPs:
Ipamorelin is a selective growth hormone secretagogue — it stimulates GH release from the pituitary without significantly affecting cortisol or prolactin levels. This is the key distinction. GHRP-6 and GHRP-2 both stimulate GH effectively, but they also increase cortisol (a stress hormone) and prolactin to varying degrees. Ipamorelin provides the GH pulse with minimal hormonal side effects.
The hunger factor:
GHRP-6 is notorious for causing intense hunger within 15-20 minutes of injection. This is because it strongly activates ghrelin receptors. GHRP-2 causes moderate hunger. Ipamorelin causes little to no hunger increase in most researchers. If appetite stimulation is a problem for your research goals (particularly if you're also running GLP-1 peptides), ipamorelin is the obvious choice.
Standard ipamorelin protocol:
100-200mcg per injection, 2-3 times daily. Best paired with Mod GRF 1-29 (CJC-1295 no DAC) at 100mcg per injection for synergistic GH release. Timing: first thing in the morning (fasted), post-workout, and before bed. The pre-bed dose is particularly valued because it amplifies the natural GH surge that occurs during deep sleep.
Fasting requirement:
GH release is blunted by elevated blood sugar and insulin. For optimal results, ipamorelin should be administered on an empty stomach — at least 2 hours after eating, and don't eat for at least 15-20 minutes after injection. This is one of the most commonly violated protocol details and likely explains why some researchers report underwhelming results.
What to measure:
IGF-1 blood levels are the standard marker for assessing GH peptide effectiveness. Get a baseline IGF-1 before starting, then retest at 4-6 weeks. A meaningful increase in IGF-1 suggests the peptide is working and your protocol is sound. Sleep quality improvements are often the first subjective sign — many researchers report deeper sleep within the first week.
Duration and cycling:
Most researchers run GH peptide protocols for 3-6 months. There's debate about whether cycling is necessary. Some researchers run continuous protocols; others cycle 5 days on / 2 days off or 3 months on / 1 month off. The rationale for cycling is to prevent pituitary desensitization, though the evidence for this with ipamorelin specifically is limited.
Ipamorelin isn't the strongest GHRP — GHRP-6 produces a larger GH pulse. But it's the most side-effect-friendly and the most versatile for stacking. For most researchers, that trade-off is worth it.
