MK-677 Dosage Guide, Side Effects & Legal Status
Oral MK-677 raises GH and IGF-1 around the clock, improving deep sleep, bone density, and lean mass without injections. See dosing data.
Chemical Makeup
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Amino Acids
MK-677
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As seen on
MK-677 Dosage Guide for Fat Loss / MuscleMK-677 Dosage Calculator
MK-677 (Ibutamoren) is a lab-made compound that mimics ghrelin to raise growth hormone and IGF-1 levels. Unlike most peptides, it's taken by mouth as a capsule or liquid, not injected. People use it to support muscle growth, recovery, sleep, and appetite.
Vial size
25 mg (capsule or liquid)
Bacteriostatic water
Oral — no BAC needed
Dosing
10–25 mg
Frequency
Daily
Cycle
8–12 weeks, then a break
Benefit
Fat Loss / Muscle
What is MK-677?
MK-677 (Ibutamoren) is a lab-made compound (not a true peptide) that you take as a pill rather than an injection, and it works by mimicking the 'hunger hormone' ghrelin to trigger a steady release of growth hormone and a related growth factor (IGF-1). It has been tested in human trials for muscle mass, bone strength, and growth hormone support in older adults. It's studied for its ability to build lean muscle and support bone density without shutting down the body's own natural hormone production.
Weight
Research targets include appetite regulation, fat metabolism, and body composition.
Growth
Research targets include growth hormone signaling, IGF-1 pathways, and tissue development.
Sleep
Research targets include circadian rhythm regulation and sleep quality pathways.
mk6
Is MK-677 FDA approved?
MK-677 is not an FDA-approved drug. It is intended for research purposes only and is not approved for human consumption, diagnostic, or therapeutic use.
Research Use Only
MK-677 has not been evaluated by the FDA for safety or efficacy in humans.
No Clinical Oversight
Not manufactured under FDA-regulated quality or clinical standards.
Unregulated Sourcing
Purity, dosing, and sourcing are not verified through FDA testing or oversight.
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How Does MK-677 Work?
It mimics the 'hunger hormone' ghrelin at its receptor in the brain, triggering a pulsing release of growth hormone and the related growth factor IGF-1. It does this without shutting down the body's own natural hormone feedback loops, the way giving growth hormone directly can.
Mimics ghrelin
Mimics the 'hunger hormone' at its brain receptor.
Pulses GH & IGF-1
Triggers a pulsing release of growth hormone and the related growth factor IGF-1.
Preserves feedback loops
Doesn't shut down the body's own natural hormone feedback, unlike direct GH.
MK-677 Targeted areas
How to reconstitute MK-677
The materials you'll need and step-by-step instructions for safely mixing MK-677 with bacteriostatic water.
Materials needed
Your MK-677 vial (lyophilized)
Alcohol swabs
Bacteriostatic sterile water
3 mL syringes (Luer Lock tip)
25G or 27G needles (Luer Lock). Other gauges may also be acceptable.
Sharps container (optional)
Remove the caps
Sanitize the rubber stoppers
Attach the needle
Draw the bac water
Pull back on the plunger to draw your desired volume of bacteriostatic water. If you overfill, just push the excess back in until you reach the right marker on the syringe.
Insert the needle into the MK-677 vial
With the bac water in your syringe, insert the needle into the MK-677 vial at a slight angle to avoid pressure buildup.
Release the water gently
Let the water run gently down the side of the vial. Don't inject it forcefully.
Swirl to dissolve
Avoid shaking. Gently swirl, flip, and roll the vial to dissolve the powder.
Check for full dissolution
Cap, dispose, and store
How to Store MK-677
The powder or capsule form can sit at room temperature in a cool, dry, dark place. Once mixed into liquid, refrigerate and use within a month, avoiding repeated freezing and thawing.
Powder/Capsule Storage
Room temperature, cool and dry, away from light and moisture.
Reconstituted Storage
Refrigerate at 2–8°C, use within 30 days.
Handling Notes
Avoid repeated freeze-thaw cycles.
What Are the Benefits of MK-677?
What research says it may help with, and how it works in the body.
growth hormone
Raised growth hormone output in older adults back toward more youthful levels, increasing 24-hour secretion by 97% in studies.
Keeps IGF-1, a growth-related hormone, elevated by 40 to 72% over long periods of use.
Increased REM (dream-stage) sleep by 20% in younger adults and by 50% in older adults in studies.
body composition
Increases fat-free body mass, with the gains favoring lean tissue like muscle.
Raised resting calorie burn (metabolic rate) by 15% within two weeks in studies.
Helped the body hold onto more protein (measured as nitrogen retention) during dieting, gaining about 2.69g per day compared to losing 8.97g per day with placebo, which helps protect muscle mass while cutting calories.
bone health
Increased markers of new bone formation by 39 to 45% within 6 to 8 weeks.
What Are the Side Effects of MK-677?
Who should avoid it, warning signs to watch for, and what to know before combining it with other compounds.
Who Should Avoid It
Heart disease or congestive heart failure
Diabetes or pre-diabetes
Active cancer
Severe cardiovascular disease
Pregnancy or breastfeeding
Stop Right Away If You Notice
Shortness of breath, chest pain, or unusual fatigue
Blood glucose levels >100mg/dL or diabetes symptoms
Liver enzyme elevation (ALT/AST >2x upper normal)
Severe fluid retention or unexplained swelling
Any concerning cardiovascular symptoms
Milder Signs to Watch For
How Long Should a MK-677 Cycle Last?
This breaks down how long a typical MK-677 cycle runs and what research suggests happens at each stage. Research shows that staying on a peptide continuously, without a break, may make it less effective over time.
That's why most research protocols build in a break between cycles, often called a washout period, to let the body reset before starting again.
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MK-677 Research References
It is a phase 2 compound
MK-677 is a phase 2 compound
25mg oral daily for 1 week showed 20% REM increase in young adults; 50% in elderly.
1997
25mg oral daily for 2 weeks showed 97% increase in 24-hour GH secretion in elderly adults.
1996
25mg oral daily for 7 days showed nitrogen retention of +2.69g/day versus placebo -8.97g/day.
1998
25mg oral daily for 2 months increased fat-free mass and energy expenditure in obese adults.
25mg oral daily for 2 months showed 39-45% increase in bone formation markers in elderly adults.
1999
Frequently Asked Questions About MK-677
Straight answers on reconstitution, dosing, and safety, everything you need to research with confidence. For research reference only.
What is MK-677 and how does it work?
MK-677 (ibutamoren) is technically not a peptide but a small-molecule, orally active ghrelin mimetic and growth hormone secretagogue. It binds the ghrelin receptor in the pituitary and hypothalamus, stimulating the release of growth hormone (GH) and, downstream, IGF-1. Unlike injectable GH-releasing peptides (e.g., CJC-1295, ipamorelin), it is taken orally and produces a more sustained, all-day elevation in GH/IGF-1 rather than a single sharp pulse.
What dosage is typically used in research and self-experimentation?
Most research and anecdotal protocols use 10-25 mg once daily, commonly taken at night on an empty stomach (its long half-life, roughly 24 hours, allows once-daily dosing). Clinical trials studying muscle and bone effects in older adults generally used 25 mg/day. There is no medically established 'safe' human dose since MK-677 is not an approved drug; any dosing information reflects research protocols and community reports, not medical guidance.
What side effects are most commonly reported?
The most frequently reported effects include increased appetite (often significant), water retention/mild edema, lethargy or grogginess, joint stiffness or aches, and transient numbness/tingling in the extremities. Because MK-677 raises GH and IGF-1, it can also reduce insulin sensitivity and raise fasting blood glucose and HbA1c with continued use, an effect seen across multiple clinical trials. Effects tend to be dose-dependent, with higher doses associated with more pronounced water retention and blood sugar changes.
How long does it take to notice effects, and how long is a typical cycle?
Users and available research commonly describe improved sleep quality, appetite, and recovery within 2-4 weeks, with changes in body composition (lean mass, fat loss) more often reported after 6-8+ weeks of consistent use. Because animal data suggest the body can upregulate somatostatin (a natural brake on GH release) with prolonged continuous use, many protocols cycle MK-677 in blocks of roughly 8-12 weeks followed by a break of several weeks, though there is no standardized clinical cycling protocol.
Is MK-677 commonly stacked with other peptides like CJC-1295 or ipamorelin?
Yes, this is one of the most common questions and combinations discussed in peptide communities. The rationale given is that injectable GHRH/GHRP peptides (CJC-1295, ipamorelin) produce a sharp, pulsatile GH release while MK-677 provides a longer, steadier elevation, so combining them is claimed to broaden the GH/IGF-1 response across the day. This combination is not studied in controlled human trials, so claims about added benefit are based on mechanism and anecdotal reports rather than clinical evidence.
Is MK-677 legal to buy and use?
MK-677 has never been approved by the FDA (or equivalent regulators elsewhere) for any human use. It is not a scheduled/controlled substance in the US, so simple possession is generally not a criminal matter, but it is sold only as a 'research use only' chemical not intended for human consumption, and marketing it for human/bodybuilding use has drawn FDA warning letters to sellers. It is also on WADA's prohibited list (category S2) for tested athletes and is flagged on the DoD's high-risk supplement list, so competitive athletes and military personnel should assume it is banned for them.
How should MK-677 be stored?
Because MK-677 is a small molecule rather than a reconstituted peptide, it is generally more stable than injectable peptides and does not require refrigeration or reconstitution. Vendors typically supply it as a stable powder or pre-dosed liquid/capsule; common guidance is to store it in a cool, dry place away from direct light and moisture, and to follow the specific supplier's stated stability and expiration information, since formulations vary.
Does MK-677 cause hair loss or affect prolactin/cortisol?
This is a frequently raised concern because ghrelin-receptor activity and increased GH/IGF-1 can theoretically influence DHT sensitivity, and some users report increased shedding, though there is no strong clinical evidence establishing MK-677 as a direct cause of hair loss. Some studies and user reports note mild increases in cortisol and prolactin with GH secretagogue use; the clinical significance of these changes in healthy adults is not well established. As with other effects, findings are drawn from limited trials and self-reported experience rather than robust human safety data.