Risk Level: MediumOral Capsule
MK-677 (Ibutamoren)
Non-Peptide Oral Growth Hormone Secretagogue & Appetite Stimulant
Aliases / Trademarks: Ibutamoren · L-163,191
A highly bioavailable oral non-peptide Growth Hormone Secretagogue Receptor (GHSR-1a) agonist. Induces robust, 24-hour ghrelin-mimicking pulses of endogenous Growth Hormone and IGF-1, enhancing appetite, deep sleep, and lean tissue recovery.
Associated Protocol Category: View Protocol Roadmap
⏱️ Real-World Expectation & Sentiment Timeline
Day 1 - 3：Intense Appetite & Deep Sleep Surge Core Milestones
Profound hunger surge; sleep becomes noticeably deeper with vivid dreams; slight morning finger puffiness
Stage Critical Guidance:If daytime hunger is excessive, shift your oral dose to 30 minutes before bed.
Standard Dosage & Administration Guidelines
Typical Dose
10mg - 25mg / day
Frequency
Once daily oral administration (morning or pre-bed; 5 on / 2 off)
Cycle Length
8 - 12 weeks per cycle
Clinical & Community Notes: Fasting glucose management is paramount! Take 500mg Berberine or Metformin with meals and moderate refined carbs to prevent gradual creeping of fasting blood sugar.
Titration Schedule & Dosing Decision Tree
Step-up ProtocolStarting & Maintenance Criteria:10mg once daily orally (pre-bed) for 2 weeks while monitoring blood glucose and appetite
Maintain 10-20mg daily for 8-12 weeks using a 5 on / 2 off schedule
Titration & Adjustment Rules:If well-tolerated with normal glucose, can increase to 20-25mg daily
| Timeline | Dosage & Frequency | Objective | Key Biomarkers / Checks |
|---|---|---|---|
| Weeks 1 - 2 | 10mg daily pre-bed (5 on / 2 off) | Deep sleep enhancement and initial tolerance evaluation | Morning fasting glucose (<5.6 mmol/L) |
| Weeks 3 - 8 | 15-20mg daily oral | Muscle fullness, recovery acceleration, and deep tissue anti-aging | Fasting blood glucose, HbA1c |
Recommended Bloodwork & Lab Biomarkers
1. Pre-Cycle Baseline Tests:
- Fasting Blood Glucose (FBG)
- HbA1c
- Baseline Serum IGF-1
2. Mid & Post-Cycle Follow-Up:
- Check fasting blood glucose monthly to ensure it remains in a healthy normal range
🚨 Critical Safety Thresholds: Discontinue immediately if fasting glucose consistently exceeds 6.5 mmol/L accompanied by polydipsia or polyuria
Educational Composite Scenarios
1 Composite Archetypesℹ️ Names, timelines, doses, lab values, and outcomes are illustrative composites. They are not actual patient records or treatment recommendations.
10-Week MK-677 Protocol: Hardgainer Caloric Overcoming & Serum IGF-1 Surging
👤 Composite Profile: Male, 28yo, 182cm, baseline 63.2kg (severe hardgainer ectomorph), hypermetabolic baseline with small stomach capacity and early satiety.
Illustrative Protocol: MK-677 15mg oral capsule taken 30 min pre-bed (to sleep through peak daytime hunger ravenousness), co-administered with 500mg Berberine with meals to buffer insulin sensitivity on a 5-on / 2-off cycle.
Illustrative Timeline:
Week 163.2kg -> 64.8kg (+1.6kg)
Taking it pre-bed yielded deep sleep; woke up with hearty appetite and zero GI discomfort.
Week 564.8kg -> 67.1kg (+2.3kg)
Mild ankle water retention at Week 3 was fully resolved within 48 hours via 400mg potassium citrate and sodium reduction.
Week 1067.1kg -> 68.8kg (+1.7kg)
Bench press surged from 65kg to 82.5kg; fasting blood glucose stayed safe at 5.3 mmol/L.
Scenario Outcome and Learning Points: Overcame hardgainer caloric deficit, adding 5.6kg (+3.4kg pure muscle on DEXA), doubling serum IGF-1 to 248 ng/mL, and doubling deep sleep duration.
💡 Educational Takeaway: MK-677 has a 24h half-life. Take it pre-bed to avoid daytime ravenous binge hunger; pair with 500mg Berberine to protect insulin sensitivity; maintain 5-on / 2-off cycling.
⚠️ Side Effect Mitigations & Community Hacks
Visual Syringe Reconstitution Calculator
Accurately calculate vial reconstitution concentration and U-100 syringe units
Syringe:
Quick Clinical & Community Presets:
mg
ml
mcg
👈 Please enter valid vial mass, water volume, and target dose on the left
① Dissolution Technique: Slowly slide BAC water down the vial wall. Never shake vigorously to protect peptide chains.
② Cold-Chain Storage: Store reconstituted liquid at 2-8°C away from light. Best used within 28-30 days.
③ Standard Syringe: Calculation based on U-100 insulin syringes (100 units = 1.0 ml).
Evidence-Based FAQs & Reddit Theoretical Mythbusters
Verified biochemical mechanisms, category physiology, and Reddit misconception clarity
1. Compound-Specific Dilemmas & Solutions
🔗 Synergistic Stacking Protocols (Synergies)
Synergy Stack
+ BPC-157
BPC-157 repairs connective tissue while MK-677 drives systemic anabolic recovery—creating a premier athletic restoration stack.
📊 Educational Composite Scenarios (1)
Illustrative 6-16 week timelines, sample biomarker metrics, and educational protocol takeaways for MK-677 (Ibutamoren).
ℹ️ Names, timelines, doses, lab values, and outcomes are illustrative composites. They are not actual patient records or treatment recommendations.
Side Effect RescueMale, 28 y/o•10 Weeks Protocol
10-Week MK-677 Protocol: Hardgainer Caloric Overcoming & Serum IGF-1 Surging
Illustrative Protocol: MK-677 15mg oral capsule taken 30 min pre-bed (to sleep through peak daytime hunger ravenousness), co-administered with 500mg Berberine with meals to buffer insulin sensitivity on a 5-on / 2-off cycle.
Final Weight
68.8 kg
+5.6 kg (Lean Mass Surged)
Lean Muscle Gained
+3.4 kg
+3.4kg Pure Lean Mass
Serum IGF-1
248 ng/mL
+98.4% (Potent Anabolic Peak)
Deep Sleep Duration
72 min / night
+125% (Deep REM Sleep)
Illustrative Weekly Highlights:
Week 1Taking it pre-bed yielded deep sleep; woke up with hearty appetite and zero GI discomfort.
Week 5Mild ankle water retention at Week 3 was fully resolved within 48 hours via 400mg potassium citrate and sodium reduction.
Week 10Bench press surged from 65kg to 82.5kg; fasting blood glucose stayed safe at 5.3 mmol/L.
💡 Educational Takeaway: MK-677 has a 24h half-life. Take it pre-bed to avoid daytime ravenous binge hunger; pair with 500mg Berberine to protect insulin sensitivity; maintain 5-on / 2-off cycling.
Inspect Full Scenario Dossier →Dedicated Dose & Syringe Calculator
💉 MK-677 (Ibutamoren) Reconstitution & Syringe Tick Tool
Standard vial size: 30mg. Recommended BAC water: 0ml. Typical dose: 10mg - 25mg / day.
Visual Syringe Reconstitution Calculator
Accurately calculate vial reconstitution concentration and U-100 syringe units
Syringe:
Quick Clinical & Community Presets:
mg
ml
mcg
Syringe Pull To Mark
10Units (Ticks on Syringe)
Equal to 0.100 ml fluid | Yields 20 doses
Conc: 2.50 mg/ml
💉 Visual Needle Simulation (U-100 Standard)Target: 10 / 100 U
① Dissolution Technique: Slowly slide BAC water down the vial wall. Never shake vigorously to protect peptide chains.
② Cold-Chain Storage: Store reconstituted liquid at 2-8°C away from light. Best used within 28-30 days.
③ Standard Syringe: Calculation based on U-100 insulin syringes (100 units = 1.0 ml).
Evidence Context and Common Questions
MK-677 (Ibutamoren) Key TakeawaysResearch References
References may include preclinical or clinical research and do not establish safety, efficacy, or dosing for an individual.
Effects of an oral ghrelin mimetic on body composition and clinical outcomes in healthy older adults
Annals of Internal Medicine · 2008