Ipamorelin vs MK-677
Oral GH booster vs injectable GH secretagogue.
Anti-agingGrowth HormonePeptideOralSleepUpdated March 2026
VS
Quick Verdict
MK-677 is oral and convenient but raises appetite and blood sugar. Ipamorelin is injectable but more selective with fewer side effects. Choose based on your tolerance for injections vs side effects.
Best for
Ipamorelin
Oral convenience, appetite stimulation, no injections needed. Good for those who won’t inject.
Best for
MK-677
Cleaner GH release, minimal appetite or blood sugar impact. Better for those who prioritize fewer side effects.
Head-to-Head Comparison
Ipamorelin
MK-677
Full Name
Full Name
Ipamorelin (Growth Hormone Secretagogue)
Ibutamoren (MK-677)
Category
Category
Peptide (Growth Hormone Secretagogue)
Non-Peptide GH Secretagogue (Oral)
Mechanism
Mechanism
Selectively stimulates ghrelin receptor to trigger pulsatile GH release from the pituitary. Minimal effect on cortisol, prolactin, or appetite — highly selective among GH peptides.
Oral ghrelin receptor agonist that stimulates GH release. Increases IGF-1, promotes appetite, and enhances sleep. Not technically a peptide but commonly grouped with GH secretagogues.
Best For
Best For
- • Anti-aging & longevity
- • Improved sleep quality
- • Fat loss & body recomposition
- • Recovery from training
- • Oral GH boosting (no injections)
- • Appetite stimulation
- • Sleep improvement
- • Muscle gain support
Evidence Level
Evidence Level
Moderate— Phase 2 trials, extensive clinical use data
Moderate— Phase 2 trials in elderly, clinical use data
Typical Dosing
Typical Dosing
200–300mcg 1–3x daily
Subcutaneous injection, ideally before bed
Subcutaneous injection, ideally before bed
10–25mg daily (oral)
Oral, taken at bedtime to mitigate appetite spike
Oral, taken at bedtime to mitigate appetite spike
Administration
Administration
Subcutaneous injection, typically at bedtime
Oral capsule or liquid, daily
Time to Effect
Time to Effect
1–2 weeks for sleep; 4–8 weeks for body composition
1–2 weeks for sleep/appetite; 8–12 weeks for body composition
Side Effects
Side Effects
Minimal — transient headache, water retention. Very well tolerated.
Increased appetite, water retention, numbness in hands, blood sugar elevation.
Blood Test
Blood Test
Recommended (IGF-1 baseline)
Recommended (fasting glucose, IGF-1)
Price Tier
Price Tier
$$$
$$
ProtocolRx
ProtocolRx
✓ We offer this
Not offered
Which One Should You Choose?
Choose Ipamorelin if you...
- ✓Want anti-aging benefits from growth hormone
- ✓Have trouble sleeping or want deeper sleep
- ✓Want fat loss without muscle loss
- ✓Prefer a gentle, selective GH peptide
- ✓Want to avoid cortisol or appetite spikes
Choose MK-677 if you...
- ✓Want GH benefits without injections
- ✓Need appetite stimulation
- ✓Want improved sleep quality
- ✓Are okay with potential water retention
- ✓Want a more affordable GH option
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