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GH-axis · Comparison

MK-677 vs Ipamorelin. Oral pill vs injectable peptide.

Two ways people chase growth hormone, one's an oral drug, one's an injectable peptide, and neither is offered here. What actually separates them.

Where each stands
MK-677 (Ibutamoren): Not availableIpamorelin: Not available
Not available
MK-677 (Ibutamoren)Oral secretagogue · not a peptide · edu-only
What it does

Raises GH and IGF-1 and stimulates appetite; studied for body composition and sleep.

Best evidence

Grade C, human GH/IGF-1 data exists; long-term outcome and safety data limited.

What we don't know

Effects on long-term glucose metabolism and cardiac parameters need more data.

Read the MK-677 (Ibutamoren) monograph
Not available
IpamorelinInjectable secretagogue · Category 2 · edu-only
What it does

Studied as a selective GH secretagogue for recovery and sleep interest.

Best evidence

Grade C, selective GH secretagogue; human outcome data limited.

What we don't know

Human outcome data is limited; long-term effects are uncharacterized.

Read the Ipamorelin monograph
How to think about choosing

These get compared constantly, but they're different kinds of thing. MK-677 (ibutamoren) is an orally-active, non-peptide ghrelin-receptor agonist that keeps GH and IGF-1 elevated around the clock, convenient, but with appetite, blood-sugar and water-retention trade-offs. Ipamorelin is an injectable, selective peptide secretagogue that adds a cleaner pulse. Both are education-only here: MK-677 isn't a peptide and isn't FDA-approved; Ipamorelin sits on FDA Category 2 (non-compoundable).

At a glance
MK-677 (Ibutamoren)
Ipamorelin
What it is
A non-peptide ghrelin-receptor agonist taken orally that sustains elevated growth hormone and IGF-1 levels.
A selective ghrelin-receptor agonist (GH secretagogue) that prompts pituitary GH release with relatively little effect on cortisol or prolactin.
What it's for
Raises GH and IGF-1 and stimulates appetite; studied for body composition and sleep.
Studied as a selective GH secretagogue for recovery and sleep interest.
Evidence grade
Grade C
Grade C
Human data
human GH/IGF-1 data exists; long-term outcome and safety data limited
selective GH secretagogue; human outcome data limited
WADA status
Banned (S2)
Banned (S2)
Regulatory status
Education only
FDA Category 2 (non-compoundable)
Key date
Education only
Education only
Peptós availability
Education only
Education only
The honest caveat

Neither is offered by Peptós.LIFE. MK-677's sustained GH/IGF-1 elevation carries real metabolic cautions (glucose, fluid retention); both are WADA-banned (S2). The legal GH-axis route is Sermorelin.

MK-677, the monographThe oral non-peptide, labeled plainly.Ipamorelin, the monographThe injectable secretagogue.Recovery, the peptide hubThe whole recovery line, sorted by what's real.

Common questions

Is MK-677 better than ipamorelin?

They're different: MK-677 is an oral non-peptide that keeps GH/IGF-1 elevated continuously (with appetite and glucose trade-offs); ipamorelin is an injectable peptide that adds a cleaner, more pulsatile release. Neither is offered here, MK-677 isn't FDA-approved and ipamorelin is non-compoundable.

Is MK-677 a peptide?

No. MK-677 (ibutamoren) is an orally-active non-peptide ghrelin-receptor agonist. It's often discussed alongside peptides but isn't one.

Medically reviewed by the Peptós.LIFE clinical team · Maintained by the Peptós.LIFE editorial team · Last updated June 2026. Educational content, not medical advice. Compounded medications are not FDA-approved.