---
title: "Ipamorelin vs MK-677 (Ibutamoren): Side-by-Side Comparison"
description: "Compare Ipamorelin vs MK-677 (Ibutamoren) — mechanism, half-life, dose range, side effects, and live vendor pricing. Ipamorelin from $24.99. MK-677 (Ibutamoren)"
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---

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3.  Ipamorelin vs MK-677 (Ibutamoren) 

# Ipamorelin vs  MK-677 (Ibutamoren)

Side-by-side comparison of Ipamorelin and MK-677 (Ibutamoren): mechanism, half-life, dose range, safety profile, and live vendor pricing. Updated continuously as new research and listings land.

Ipamorelin from $24.99

MK-677 (Ibutamoren) from $74.99

## Live price snapshot

### Ipamorelin

Current low

$59.99

as of Sep 5, 2026

7-day low

$59.99

30-day low

$59.99

30-day change

— 

baseline building

### MK-677 (Ibutamoren)

Current low

$89.99

as of Sep 5, 2026

7-day low

$89.99

30-day low

$89.99

30-day change

— 

baseline building

## Ipamorelin

Ipamorelin is a selective pentapeptide ghrelin receptor (GHS-R1a) agonist — one of the most studied growth hormone secretagogues (GHS) in the biohacking community and the modern companion to CJC-1295 / MOD-GRF 1-29. Its…

**Live lowest price:** $24.99 across 5 vendors

[Full Ipamorelin profile](/compound/ipamorelin)

## MK-677 (Ibutamoren)

MK-677 (also called Ibutamoren or Nutrobal) is an orally-active, non-peptide ghrelin receptor (GHS-R1a) agonist developed by Merck Research Laboratories in the 1990s. Unlike Ipamorelin, GHRP-2, or hexarelin — all of…

**Live lowest price:** $74.99 across 2 vendors

[Full MK-677 (Ibutamoren) profile](/compound/mk-677)

## Side-by-side comparison

Attribute

Ipamorelin

MK-677 (Ibutamoren)

Category 

Growth Hormone / IGF-1 Axis

Growth Hormone / IGF-1 Axis

Research Stage 

Phase 2

Phase II

Mechanism of Action 

Ipamorelin acts as a selective agonist at the growth hormone secretagogue receptor 1a (GHS-R1a), the same receptor activated by endogenous ghrelin - the "hunger hormone" secreted primarily by P/D1 cells in the gastric fundus. The distinguishing feature of…

MK-677 is a small-molecule full agonist at the growth hormone secretagogue receptor 1a (GHS-R1a) - the same receptor activated by endogenous ghrelin and the peptide GHS compounds (Ipamorelin, GHRP-2, GHRP-6, hexarelin). What distinguishes MK-677 is its…

Half-Life 

~2 hours (plasma)

~24 hours (oral)

Typical Dose Range 

100-300 mcg subcutaneous 1-3x daily (most commonly 200-300 mcg pre-bedtime); often combined with CJC-1295 without DAC at 100-300 mcg

10,000–25,000 mcg (10–25 mg) oral daily

Dosing Frequency 

1–3 times daily; most commonly once at bedtime

Once daily, typically at bedtime

Administration 

subcutaneous, intravenous (clinical only)

oral

Side Effects 

Ipamorelin has the cleanest side-effect profile of any ghrelin-receptor agonist, which is why it dominates modern biohacking protocols. The profile is driven by (a) selective GHS-R1a agonism without cross-receptor activity, and (b) acute GH elevation (the same…

MK-677 has the most pronounced side-effect profile of any GHS compound - specifically because its 24-hour half-life produces sustained rather than pulsatile receptor engagement. Users should expect all of the side effects listed below at some frequency. Common…

Molecular Weight 

711.9 Da

528.7 Da

Common Vial Sizes 

2mg, 5mg

25mg capsules, 30mL liquid

## Price History

4 data points 

-   OF 
-   VANDL Labs 
-   Ion Peptide 
-   Disguised Alpha 

## Price History

2 data points 

-   VANDL Labs 
-   Disguised Alpha 

### Ipamorelin — potential benefits

-   Increased GH pulse amplitude (selective somatotroph activation) 
-   Elevated IGF-1 (~30-80% over baseline) with consistent dosing 
-   Improved slow-wave sleep architecture 
-   No cortisol / prolactin / ACTH elevation (unique among GHS peptides) 
-   Accelerated connective tissue and wound repair 
-   Modest lean body mass gain + fat loss in hypogonadal adults 
-   Enhanced recovery between training sessions 
-   Synergistic effect with CJC-1295 / MOD-GRF 1-29 

### MK-677 (Ibutamoren) — potential benefits

-   Increased IGF-1 (~80-100% over baseline at steady state) 
-   Improved slow-wave sleep architecture 
-   Lean body mass increase (demonstrated in 2-year older adult trial) 
-   Improved connective tissue / wound / bone repair 
-   Once-daily oral convenience (no injections) 
-   Appetite stimulation (benefit for underweight or hard-gainer populations) 
-   Enhanced recovery between training sessions 
-   Potential bone mineral density improvement 

In-depth comparison

## Ipamorelin vs MK-677 (Ibutamoren): the long answer

Ipamorelin is a peptide ghrelin-receptor agonist (GH secretagogue) — injectable, short half-life, pulsatile GH release matching the body's natural rhythm. MK-677 (ibutamoren) is an oral non-peptide ghrelin mimetic with 24-hour half-life, producing sustained 24/7 elevation in GH and IGF-1. Ipamorelin wins on physiological signal pattern and side-effect profile; MK-677 wins on convenience and total IGF-1 lift.

Last reviewed: May 17, 2026

### Mechanism — pulsatile vs continuous

Both hit the ghrelin/GH-secretagogue receptor (GHS-R1a) and trigger pituitary GH release without affecting cortisol or prolactin (which sets both apart from older GHRPs like GHRP-2 and GHRP-6). Ipamorelin's short half-life (~2 hours) means GH spikes return to baseline between doses, mimicking the natural pulsatile GH pattern. MK-677's 24-hour half-life produces continuous receptor activation — GH and IGF-1 stay elevated around the clock, no pulses.

-   **Ipamorelin:** Peptide. Half-life ~2 hours. Injectable. Pulsatile GH release. 
-   **MK-677 (ibutamoren):** Non-peptide small molecule. Half-life ~24 hours. Oral. Continuous GH/IGF-1 elevation. 
-   **Why pulsatile matters:** Natural GH secretion is pulsatile. Continuous elevation (MK-677) may downregulate receptor sensitivity over months and is implicated in the appetite + fluid retention side effects. 

### What they do — measurable outputs

Both raise serum GH transiently and IGF-1 chronically. Published research shows MK-677 at 25 mg/day raises IGF-1 by ~60-80% from baseline within 2 weeks, sustained over 12+ months in trials. Ipamorelin at 200-300 mcg 2-3x/day raises IGF-1 by ~30-50% over similar timeframes — smaller lift, but cleaner physiological signal. Both improve sleep quality, body composition (modest lean mass + fat loss in trials), and recovery metrics. MK-677 produces noticeably more sleep depth in week 1-2 due to the GH-on-during-sleep effect.

-   **MK-677 IGF-1 lift:** ~60-80% above baseline at 25 mg/day, sustained 12+ months in trials 
-   **Ipamorelin IGF-1 lift:** ~30-50% above baseline at 300 mcg 3x/day, similar trial duration 
-   **Sleep effect:** Both improve sleep architecture; MK-677 more noticeably in week 1-2 due to overnight GH elevation 

### Dosing — once-daily oral vs daily injections

MK-677 protocol: 12.5-25 mg/day oral, single dose before bed (to align with natural sleep GH pulse). Sustained for 12-week cycles or year-long depending on goals. Ipamorelin protocol: 200-300 mcg subQ 2-3x/day for serious users, or 200-300 mcg once before bed for casual users. Cycle 12 weeks on, 4 weeks off to prevent receptor desensitization. Both are typically combined with a GHRH analog (CJC-1295) for the synergistic GH pulse.

-   **MK-677 dose:** 12.5-25 mg/day oral, single dose before bed. No cycling required in trial data. 
-   **Ipamorelin dose:** 200-300 mcg subQ 2-3x/day (or 1x at bedtime for minimal protocol). 12-week cycles with 4-week breaks. 
-   **Common stacks:** Both pair with CJC-1295 (no DAC) for GHRH + ghrelin-receptor synergy. Stack drives larger total GH pulse. 

### Safety — different side effect profiles

Ipamorelin's clean profile (no cortisol/prolactin elevation, no appetite spike) makes it the better-tolerated option for most users — common complaints are limited to injection-site irritation and occasional flushing. MK-677's continuous receptor activation produces more side effects: increased appetite (sometimes substantial — users gain 5-15 lbs without diet control), water retention (1-3 kg over 4-6 weeks), elevated fasting glucose and HbA1c (especially relevant for pre-diabetic users), and occasional carpal tunnel symptoms from fluid retention. Neither has been associated with cancer risk in trial data despite extensive long-term use (Merck ran MK-677 in older adults for years).

-   **Ipamorelin side effects:** Injection-site irritation, occasional flushing. Clean profile — no cortisol/prolactin/appetite issues. 
-   **MK-677 side effects:** Increased appetite, 1-3 kg water retention, elevated fasting glucose (monitor HbA1c), occasional carpal tunnel symptoms 
-   **Glucose risk on MK-677:** Particularly relevant for users with pre-diabetes or metabolic syndrome. Get baseline + 12-week HbA1c if running MK-677 long-term. 

### Cost — MK-677 is cheaper

Research-use MK-677 runs ~$0.50-1.20 per 10 mg dose via tracked vendors. At 25 mg/day, that's ~$30-70/month — cheap. Research-use ipamorelin runs ~$0.20-0.50/mg. At 300 mcg 3x/day (900 mcg/day = 0.9 mg), that's ~$5-15/month for the peptide itself but you need injection supplies. MK-677 oral convenience is a real advantage — no syringes, no reconstitution, no fridge storage.

-   **MK-677 cost:** $0.50-1.20 per 10 mg → ~$30-70/month at 25 mg/day 
-   **Ipamorelin cost:** $0.20-0.50/mg → ~$5-15/month at 900 mcg/day total (plus supplies) 
-   **Live prices:** Both track on /compound/ipamorelin and /compound/mk-677 

### Who chooses which

Pick ipamorelin if you want physiological signal pattern, clean side-effect profile, and you don't mind subQ injections 1-3x/day. Pick MK-677 if you want maximum convenience (oral once daily), the strongest IGF-1 lift, and you can monitor your glucose to catch the fasting-glucose drift. Bulking-phase users often choose MK-677 for the appetite boost; cutting-phase users prefer ipamorelin to avoid the water retention. Older users (50+) targeting longevity markers tend to choose MK-677 for the larger sustained IGF-1 lift.

-   **Choose ipamorelin if:** Cutting phase, glucose-sensitive, want physiological pulsatile signal, comfortable with injections 
-   **Choose MK-677 if:** Bulking phase, oral convenience priority, want max IGF-1 lift, willing to monitor HbA1c 

## Frequently asked

### What's the difference between Ipamorelin and MK-677 (Ibutamoren)?

Ipamorelin is a growth hormone / igf-1 axis that ipamorelin acts as a selective agonist at the growth hormone secretagogue receptor 1a (ghs-r1a), the same receptor activated by endogenous ghrelin - the "hunger hormone" secreted…. MK-677 (Ibutamoren) is a growth hormone / igf-1 axis that mk-677 is a small-molecule full agonist at the growth hormone secretagogue receptor 1a (ghs-r1a) - the same receptor activated by endogenous ghrelin and the peptide ghs compounds…. The two differ in mechanism, half-life (~2 hours (plasma) vs ~24 hours (oral)), and typical dose range.

### Which has the longer half-life, Ipamorelin or MK-677 (Ibutamoren)?

Ipamorelin has a half-life of ~2 hours (plasma). MK-677 (Ibutamoren) has a half-life of ~24 hours (oral). Longer half-lives generally mean less frequent dosing but slower on/off kinetics.

### Which is cheaper, Ipamorelin or MK-677 (Ibutamoren)?

Current lowest live price on BodyHackGuide: Ipamorelin from $24.99, MK-677 (Ibutamoren) from $74.99. Prices are pulled from the vendor listings tracked on BHG and change frequently — see the compare tables on each compound page for the current set of offers.

### Can you stack Ipamorelin and MK-677 (Ibutamoren)?

Stacking depends on mechanism overlap, safety profile, and goals. Ipamorelin and MK-677 (Ibutamoren) should only be stacked after reviewing each compound's individual protocol page, side effect profile, and any published interaction data. Use the BodyHackGuide stack builder for a structured review before combining research compounds.

### Which raises GH more, ipamorelin or MK-677?

MK-677 raises sustained GH and IGF-1 more. At 25 mg/day, MK-677 lifts IGF-1 by ~60-80% from baseline; ipamorelin at typical doses lifts it ~30-50%. But MK-677's elevation is continuous (24/7), while ipamorelin produces sharp pulses. Total integrated IGF-1 area-under-curve favors MK-677; pulsatile physiological pattern favors ipamorelin.

### Can you cycle MK-677 with ipamorelin?

Some users alternate: MK-677 for 12 weeks → 4 week break → ipamorelin for 12 weeks → 4 week break → repeat. The rationale is rotating receptor stimulation patterns to prevent desensitization. No published comparative data on whether this beats running either alone, but it's common in the longevity-focused community.

### Does MK-677 cause diabetes?

MK-677 elevates fasting glucose and HbA1c modestly in trials (typical lift: 0.1-0.3 HbA1c points at 25 mg/day over 12 weeks). It does not cause type 1 diabetes. In users with pre-existing pre-diabetes or metabolic syndrome, the glucose drift can push them across diagnostic thresholds — monitor HbA1c at baseline and 12 weeks if you're at risk.

### Why is ipamorelin injected and MK-677 oral?

Ipamorelin is a peptide — peptides get destroyed in gastric acid, so oral doesn't work. MK-677 is a small-molecule non-peptide ghrelin mimetic specifically designed to survive the digestive tract. That's why MK-677 was developed in the first place: same receptor target as the GHRPs, but pill-form viable.

### Can you stack ipamorelin and MK-677?

Technically possible — they hit the same receptor but ipamorelin's pulsatile pattern adds to MK-677's sustained baseline. Practically not recommended: you'd compound the side effects (appetite, water retention, glucose lift) without much additional IGF-1 lift since the receptor is already heavily activated by MK-677. Most users pick one. If you want stacking, ipamorelin + CJC-1295 (GHRH) is the canonical combo.

## See current vendor prices

Live listings from the vendors we track, refreshed continuously.

[Ipamorelin prices](/compound/ipamorelin?tab=prices) [MK-677 (Ibutamoren) prices](/compound/mk-677?tab=prices) [Compare all compounds](/compare)

### Before you buy Ipamorelin or MK-677 (Ibutamoren)

Check the vendor trust score. Every supplier we track is rated 0–100 on COA verification, payment transparency, shipping, reviews, and listings — one published, reproducible methodology, applied to every vendor including BHG Labs, which shares our ownership.

[View Vendor Scorecard](/vendors/scorecard)

## Related comparisons

[CJC-1295 vs Ipamorelin](/compare/cjc-1295-vs-ipamorelin)[Sermorelin vs Ipamorelin](/compare/sermorelin-vs-ipamorelin)[MK-677 vs CJC-1295](/compare/mk-677-vs-cjc-1295)[Hexarelin vs Ipamorelin](/compare/hexarelin-vs-ipamorelin)[IGF-1-LR3 vs Ipamorelin](/compare/igf-1-lr3-vs-ipamorelin)[GHRP-2 vs Ipamorelin](/compare/ghrp-2-vs-ipamorelin)[Tesamorelin vs CJC-1295](/compare/tesamorelin-vs-cjc-1295)[GHRP-2 vs GHRP-6](/compare/ghrp-2-vs-ghrp-6)

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Company

#### Company

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