MK677

MK-677 (Ibutamoren) is a non-peptide, orally active growth hormone secretagogue. Unlike injectable peptides, MK-677 can be taken orally and still produce sustained GH and IGF-1 elevation — making it unique among GH stimulators. Supplied as lyophilized powder with ≥98% purity (HPLC-verified).

How It Works

MK-677 mimics ghrelin at the ghrelin receptor (GHS-R1a), but with a much longer duration of action. It also suppresses somatostatin — the hormone that normally turns off GH release. This dual mechanism (stimulate GH release + block the off switch) produces sustained GH elevation for 24 hours after a single dose.

Research Data

• IGF-1 increase: Clinical studies show MK-677 increases IGF-1 levels by 40-80% within days, with sustained elevation throughout treatment. At higher doses, increases of over 100% have been reported.
• GH pulse amplification: Increases the amplitude of natural GH pulses by 60-80% while maintaining the physiological pulse pattern — not a constant flood, but stronger pulses.
• Oral bioavailability: Unlike peptide GH secretagogues that require injection, MK-677 is orally active with excellent absorption and bioavailability.
• Lean body mass: Studies in older adults showed significant increases in lean body mass and muscle strength over 12 months.
• Bone density: Research demonstrates increased bone turnover markers and improved bone mineral density, suggesting applications in osteoporosis research.
• Sleep quality: Subjects in clinical trials reported improved sleep quality and increased REM sleep duration — consistent with enhanced nocturnal GH pulses.
• No desensitization: Unlike some GH stimulators, MK-677 maintains effectiveness over long-term use without significant receptor downregulation.

Research Applications

• Oral GH secretagogue pharmacology
• Sustained IGF-1 elevation models
• Body composition and frailty research
• Bone metabolism and osteoporosis studies

Product Specifications

• Purity: ≥98% (HPLC)
• Form: Lyophilized powder
• Solubility: Reconstitute in sterile bacteriostatic water or appropriate buffer

Storage & Handling

• Store lyophilized powder at -20°C, protected from light and moisture.
• After reconstitution, aliquot and store at -20°C. Avoid repeated freeze-thaw cycles.

Disclaimer: This product is intended exclusively for laboratory and research purposes. It is not a drug, dietary supplement, or food product. Not for human or veterinary use.

What the Internet Says

This is what online communities discuss about this compound. Not medical advice, not a recommendation — just what people are saying. For laboratory research use only.

Community Buzz

MK-677 — often called “oral HGH” — is the most convenient GH-boosting compound in existence: no injections, just a pill or liquid. It’s a ghrelin mimetic (not actual HGH and not a SARM, despite being sold alongside them), meaning it binds to ghrelin receptors and drives your pituitary to release more growth hormone — pulsing GH up to 2x normal output for hours. The community’s love-hate relationship revolves around three things: extreme hunger (users wake up ravenous at 3 AM), amazing sleep (deep, vivid dreams, waking up feeling fully rested), and impressive IGF-1 elevation (blood work confirms it works — 40-80% increases are common). In lookmaxing circles, it’s popular for its oral convenience and claims of improving skin thickness, hair quality, and even facial bone structure when combined with mewing. The #1 warning: it can mess with your insulin sensitivity. Long-term use without managing blood sugar is described as making you a “walking diabetic” — berberine, metformin, or monitored cycling are standard community mitigations.

Why People Are Interested

• No injections — just swallow it. The single biggest advantage over every other GH secretagogue. Perfect for needle-phobic users or anyone tired of daily pinning.
• Eat more, grow more. For hard-gainers and bulking phases, the intense appetite is a feature — calorie surpluses become effortless.
• Sleep becomes incredible. Users consistently report the best sleep of their lives — deep, restorative, with vivid dreams. Many use it primarily for sleep quality.
• Skin, hair, and nails improve. Thicker hair, stronger nails, better skin texture — the visible “anti-aging” benefits that make MK-677 popular beyond just bodybuilding circles.

Popular Combinations

• MK-677 + CJC-1295 With DAC: The “GH maximizer” stack — oral MK-677 for ghrelin pathway plus injectable CJC-DAC for sustained GHRH signaling. Maximum secretagogue-driven IGF-1 elevation.
• MK-677 + Berberine or Metformin: Critical insulin sensitivity management — MK-677 raises blood sugar; berberine/metformin counteracts this. Almost mandatory for longer cycles.
• MK-677 + GHRP-6: Rare and extreme — both are potent ghrelin agonists. Only for extreme bulking with truly unmanageable hunger as the trade-off.

⚠️ Sourced from public forums (Reddit r/Peptides, r/Biohackers, r/SARMs), lookmaxing forums, bodybuilding communities, and peptide blogs. MK-677 is NOT a SARM despite being sold alongside them. Insulin resistance is the #1 long-term concern — blood sugar monitoring and cycling are strongly advised. Extreme water retention (5-10 lbs in first week) is nearly universal — mostly glycogen loading, resolves after 1-2 weeks. Hunger at night can disrupt sleep if not managed. Community protocols are experimental. This information is for awareness only.