PinnyPeptide

GHRP-2 vs Ipamorelin

Side-by-side comparison: effects, dosing ranges, side effects, regulatory status, and reconstitution.

Peptide A

GHRP-2

Growth Hormone

Refined ghrelin mimetic — stronger GH release than GHRP-6 with less hunger.

Peptide B

Ipamorelin

Growth Hormone

Selective growth hormone secretagogue with minimal side effects.

Typical vial

5 mg

Typical dose

100 mcg

Half-life

~15-60 minutes

FDA status

Not FDA approved for any indication.

Typical vial

5 mg

Typical dose

100-300 mcg

Half-life

~2 hours

FDA status

Not FDA approved for human use. Clinical development discont…

GHRP-2 effects

  • Stronger pulsatile GH release than GHRP-6 at equivalent doses
  • Less appetite stimulation than GHRP-6 (but more than Ipamorelin)
  • Synergizes with GHRH analogs for amplified GH pulses
  • Used clinically (Japan) to diagnose adult growth hormone deficiency
  • Secondary IGF-1 elevation over multi-week courses

Ipamorelin effects

  • Selectively stimulates growth hormone release
  • Promotes fat metabolism without affecting cortisol
  • Supports lean muscle growth and recovery
  • Improves sleep quality through enhanced GH pulsatility
  • Does not significantly increase appetite or prolactin

GHRP-2 side effects

  • Mild appetite increase (less than GHRP-6)
  • Elevated prolactin and cortisol (less than GHRP-6)
  • Head rush or flushing immediately after injection
  • Water retention with chronic dosing
  • Possible tachyphylaxis with continuous high-frequency use

Ipamorelin side effects

  • Mild head rush or flushing immediately after injection
  • Transient water retention
  • Injection site irritation
  • Occasional lightheadedness

GHRP-2 dosing ranges

GH optimization / anti-aging

100 mcg · Two to three times daily (SubQ) · 8-12 weeks

Combined with CJC-1295 (Mod GRF)

100 mcg of each · Two to three times daily · 8-12 weeks

Adult GHD diagnostic (Japan, clinical)

100 mcg IV bolus · Single dose · One-time test

Ipamorelin dosing ranges

GH optimization and anti-aging

100-300 mcg · Two to three times daily (SubQ) · 8-12 weeks

Combined with CJC-1295 (Mod GRF)

100-200 mcg · Two to three times daily · 8-12 weeks

Full GHRP-2 guide → Full Ipamorelin guide →

GHRP-2 vs Ipamorelin — common questions

What is the difference between GHRP-2 and Ipamorelin?

GHRP-2: Refined ghrelin mimetic — stronger GH release than GHRP-6 with less hunger. Typical dose 100 mcg. Ipamorelin: Selective growth hormone secretagogue with minimal side effects. Typical dose 100-300 mcg. Both fall under the Growth Hormone category.

Can you stack GHRP-2 and Ipamorelin?

Stacking GHRP-2 with Ipamorelin is a protocol-design question best raised with a clinician — it depends on your goal, current bloodwork, and whether both peptides target overlapping mechanisms. Both peptides should be tracked independently with separate injection sites and timing. PinnyPeptide supports multi-peptide stacks with automatic injection site rotation.

Which is dosed more frequently, GHRP-2 or Ipamorelin?

GHRP-2 is typically dosed: Two to three times daily (SubQ) for GH optimization / anti-aging; Two to three times daily for Combined with CJC-1295 (Mod GRF); Single dose for Adult GHD diagnostic (Japan, clinical). Ipamorelin is typically dosed: Two to three times daily (SubQ) for GH optimization and anti-aging; Two to three times daily for Combined with CJC-1295 (Mod GRF).

Are GHRP-2 and Ipamorelin FDA approved?

GHRP-2: Not FDA approved for any indication. Ipamorelin: Not FDA approved for human use. Clinical development discontinued by Novo Nordisk.

Related peptide comparisons

cjc-1295 vs ghrp-2ghrp-2 vs ghrp-6ghrp-2 vs hexarelinghrp-2 vs sermorelinghrp-2 vs tesamorelinaod-9604 vs ipamorelin

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