MK-677
Also known as: Ibutamoren, Nutrobal, L-163,191
Primary recreational use: Body composition improvements and anti-aging effects
What is MK-677?
MK-677, also known as Ibutamoren, is an orally active growth hormone secretagogue developed to mimic ghrelin, promoting growth hormone release. It is primarily used for enhancing body composition, improving sleep quality, and maintaining muscle mass. Although it is not FDA-approved, MK-677 is under investigation in Phase II trials. Key risks include potential insulin resistance and increased appetite impacting glucose levels.
Primary Benefits
Improves sleep quality. Increases lean body mass. Enhances growth hormone secretion.
How It Works
MK-677 binds to ghrelin receptors (GHSR) in the brain, particularly in the hypothalamus and pituitary, stimulating growth hormone release and increasing IGF-1 levels. It mimics endogenous ghrelin, maintaining natural growth hormone production without suppression. Its long half-life supports sustained effects with once-daily dosing.
Safety Tips
Precautions reported in community discussions and literature. This is not a complete list.
- 1.DON'T exceed the typical dose of 25 mg daily without assessing tolerance.
- 2.NEVER use MK-677 if you have heart disease or diabetes without medical supervision.
- 3.AVOID using it as a dietary supplement as it is not FDA approved for such.
- 4.DON'T rely solely on MK-677 for body composition improvements without diet/exercise.
- 5.NEVER use products labeled as 'research only' for human consumption, due to unknown purity.
Use Contexts
Different purposes have different protocols, dosing, and considerations
Body composition and anti-aging
moderate evidenceUsed to improve body composition by increasing lean body mass and potentially aiding in anti-aging through sustained GH elevation.
Evidence: Community reports and some studies indicate effectiveness for body composition.
The following are ranges reported in published literature and community discussions. These are NOT recommendations or medical advice.
Timing: Before bed on an empty stomach
Notes: Consistency in daily timing recommended
Community-Reported Protocols
Not recommendations: The following protocols are compiled from online communities and published literature. Pepbase does not endorse, recommend, or verify these protocols. They are provided for informational purposes only. Individual responses vary significantly. Consult a licensed medical professional before any use.
| Reported Goal | Reported Dose | Reported Frequency | Reported Route |
|---|---|---|---|
| Body composition/anti-aging | 25mg | 1x daily | Oral (bedtime, empty stomach) |
Pharmacokinetics
Reported Side Effects
This is not a complete list. Other side effects may occur.
Common
Serious / Rare
- Risk of congestive heart failure
Storage
Sleep improvement
moderate evidenceAims to enhance sleep quality and architecture, often seen within weeks of consistent use, by aligning dosing with natural GH release patterns.
Evidence: Studies and anecdotal reports support improved sleep quality.
The following are ranges reported in published literature and community discussions. These are NOT recommendations or medical advice.
Timing: 30 minutes before bed or as directed
Notes: Best taken on an empty stomach
Community-Reported Protocols
Not recommendations: The following protocols are compiled from online communities and published literature. Pepbase does not endorse, recommend, or verify these protocols. They are provided for informational purposes only. Individual responses vary significantly. Consult a licensed medical professional before any use.
| Reported Goal | Reported Dose | Reported Frequency | Reported Route |
|---|---|---|---|
| Sleep quality improvement | 25mg | 1x nightly | Oral (30 min before bed) |
Pharmacokinetics
Reported Side Effects
This is not a complete list. Other side effects may occur.
Common
Storage
Harm Reduction Information
Quality Concerns
- Products lacking proper certificates of analysis might be impure.
Safety Tips
- Always check for third-party testing.
- Start with a lower dose to see how your body reacts.
- Store in a cool place away from moisture.
- Track appetite and sleep changes to adjust dose if needed.
- Use pharmaceutical-grade products when possible.
Warning Signs to Stop
- Unusual swelling or rapid weight gain
- Severe lethargy
- Uncontrolled blood glucose levels
Seek Medical Help Immediately If
- Immediate medical help needed for signs of heart failure, such as shortness of breath or chest pain.
Frequently Asked Questions
Common questions about MK-677
How long until I see effects?
With MK-677, users report improved sleep quality within the first 2 weeks and noticeable body composition changes by 12-16 weeks.
What time of day should I take it?
Taking MK-677 at bedtime, ideally on an empty stomach, aligns with natural growth hormone cycles and minimizes daytime hunger.
How can I minimize side effects?
To minimize side effects of MK-677, monitor blood sugar levels and start with a low dose to assess your body's response.
Does tolerance develop?
Prolonged use of MK-677 can lead to desensitization to its effects, thus some users find cycling (8-12 weeks on, 4-8 weeks off) beneficial.
How should I store it?
Store MK-677 capsules at room temperature in a cool, dry place away from direct light.
Do I need to cycle it?
Cycling MK-677 is often practiced, with 8-12 weeks on followed by a break of equal duration to maintain efficacy.
Reported Combinations
Compounds reported to be used alongside MK-677 in community discussions
CJC-1295
Enhances growth hormone release synergistically
Ipamorelin
Used together for robust GH secretion
BPC-157
May aid in recovery and repair when used alongside
TB-500
Support tissue repair and healing processes
Reported Interactions
Interactions reported in literature and community discussions.
May enhance feelings of stimulation; monitor how you feel.
Altered blood glucose levels could interfere with insulin management.
May influence heart function; monitor cardiovascular health closely.
Reconstitution Calculator
100 units = 1 mL
Safety Tips
- Always consult a licensed medical professional for dosing and reconstitution instructions.
- Always double check your units. Mixing up mg and mcg can be very dangerous.
- Make sure to select your syringe type. U-100 and U-50 syringes have different units.
- Ensure you're not adding more BAC than your vial can hold. Most vials have maximum capacities listed.
This calculator is for informational and educational purposes only. It does not provide medical advice, dosing recommendations, or safety determinations. Reference ranges shown are compiled from publicly available sources and are not a substitute for guidance from a licensed healthcare professional.
Legal Status by Region
Regulatory status varies by country
USA
investigational
UK
investigational
EU
investigational
Australia
investigational
Canada
investigational
Explore More Research
Browse our database of peptide research information compiled from published literature and community sources.
Citations
Last updated: October 5, 2023