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Comparison

MK-677 (Ibutamoren) vs Ipamorelin

MK-677 vs Ipamorelin: oral vs injectable GH-axis support, with side effect and tolerance trade-offs.

The verdict

The real split is oral versus injection. MK-677 is a daily oral that keeps GH and IGF-1 elevated around the clock, which is convenient but comes with strong appetite stimulation and more water retention. Ipamorelin is injected and works in pulses, so it's easier on appetite and feels closer to the body's natural rhythm. Pick MK-677 if you'll never inject and don't mind the hunger; pick Ipamorelin if you want the cleaner, more pulsatile profile and the needle isn't a dealbreaker.

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MK-677 (Ibutamoren)
GH-axisEvidence: Moderate

MK-677 is the only oral GH-axis compound that actually works. It tricks your body into thinking it's hungry, which signals more GH release. Big appetite increase is the trade-off, great in a bulk, awful in a cut.

Onset
65
Documentation
75
Side intensity
100
Popularity
80
006
Ipamorelin
GH-axisEvidence: Limited

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.

Onset
65
Documentation
75
Side intensity
64
Popularity
75
Side-by-side
Field
Left
Right
Category
GH-axis
GH-axis
Half-life
~24 hours
~2 hours
Route
Oral
Subcutaneous
Schedule
Once daily
1-3x daily
Cycle length
8-12 weeks on, 4 weeks off
8-12 weeks on, 4 weeks off
Dose
10-25 mg orally, once daily, taken before bed.
100-300 mcg sub-q, 1-3x daily. Pre-bed dose is the most important pulse.
FDA
Not FDA approved. Reached Phase 2 trials, never approved.
Not FDA approved.
WADA
Banned (S2)
Banned (S2)
Natty?
Not natty
Not natty
Prescribed
Not prescribed in conventional medicine. Sometimes offered by anti-aging clinics off-label.
Some anti-aging and longevity clinics prescribe via compounding pharmacies, off-label.
Top side effects
Aggressive appetite stimulation; Water retention / bloat; Numb/tingling hands (carpal-tunnel-like)
Head-rush at injection; Mild hunger pulse 30 min post-dose; Tingling in hands rarely

Which one should you pick?

Pick MK-677 (Ibutamoren) if users who want gh benefits but won't inject or people in a bulking / mass-gain phase.

Pick Ipamorelin if users wanting gh benefits without the bloat / sides of hgh or sleep / recovery focused stacks.

Note: these two are commonly stacked together rather than chosen between. See the entries for the canonical protocol.

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