The short version.
If you read nothing else, read this. The whole guide in a handful of bullets.
- What it is: MK-677, also called Ibutamoren, is an orally active ghrelin mimetic. It is not a steroid or a hormone itself, it tells your own body to release more growth hormone.
- What people run it for: lean muscle, faster recovery, deeper sleep, and the appetite boost that helps a bulk, very often stacked with a GH peptide or a SARM cycle.
- Typical dose: 10–25 mg once daily, usually taken before bed.
- Routes: oral only. It is a capsule or oral liquid, with no reconstitution and no injections.
- Cycle: commonly run in blocks of 8 to 16 weeks, then a break, rather than continuously.
- Honest caveat: MK-677 reliably raises GH and IGF-1 in trials, but the same research flagged worse insulin sensitivity and, in frail elderly patients, more heart failure. It is sold for research use only, and this is not medical advice.
Quick reference.
| Typical dose | 10–25 mg once daily |
|---|---|
| Routes | Oral capsule or liquid (no injection) |
| Frequency | Once a day, often before bed |
| Cycle length | ~8 to 16 weeks, then a break |
| Best for | Lean mass, recovery, sleep, appetite for a bulk |
What is MK-677?
MK-677, known by the name Ibutamoren, is a little different from most of the compounds on this site. It is not actually a peptide, it is a small orally active molecule, but it gets grouped with growth-hormone peptides because it does a very similar job through a clever trick.
That trick is mimicking ghrelin, the hormone that makes you hungry and that also signals your pituitary to release growth hormone. By imitating ghrelin, MK-677 prompts your own body to put out more of its own GH, which then raises IGF-1, the downstream signal tied to muscle growth, recovery, and tissue repair.
The version sold by vendors usually arrives as capsules or an oral liquid. It is not an injectable, not a steroid, and not a stimulant. People reach for it because it raises GH and IGF-1 without needles, and because of the side benefits people report along the way, mainly deeper sleep and a big appetite.
Worth saying plainly: MK-677 is not an approved medicine anywhere. It is sold strictly for research use only. And while it reliably raises GH and IGF-1 in trials, the same research raised real safety flags around blood sugar and, in one frailty trial, heart failure. We get into what that means further down.
How it works in the body.
You do not need a biology degree to follow this. Here is the simple picture, then a little more for the curious.
The core idea is that MK-677 does not give you growth hormone, it convinces your own pituitary to release more of it. It does this by imitating ghrelin, and it works through a few overlapping mechanisms that show up in the research.
- Ghrelin mimicry. MK-677 binds the ghrelin receptor (GHS-R1a) in the brain and pituitary. That is the same receptor your hunger hormone uses, which is why appetite jumps, and it is the trigger for a natural GH pulse.
- More GH, less brake. It boosts growth-hormone-releasing hormone and quiets somatostatin, the hormone that normally puts the brakes on GH. The net effect is more of your own growth hormone, released in natural pulses.
- Higher IGF-1, around the clock. Because its half-life is about 24 hours, one daily dose lifts your 24-hour GH and IGF-1 baseline. Trials show IGF-1 climbing meaningfully within a few weeks of daily use.
How to take it: routes of administration.
MK-677 is one of the few compounds here that is genuinely oral. There is no injection and no choice of needle, the only real question is when in the day you take it. Here is the honest comparison.
| Route | Typical dose | Absorption | Best for | Difficulty |
|---|---|---|---|---|
| Oral capsule | 10–25 mg | Good, once daily | Convenience, standard use | No needles, easy to dose |
| Oral liquid | 10–25 mg | Good, once daily | Fine-tuning the dose | Flexible, but measure carefully |
| Injection | Not used | n/a | Not applicable | MK-677 is orally active, so injecting is pointless |
Oral capsule
The standard form by far. MK-677 survives digestion and is absorbed well by mouth, which is its whole selling point over injectable GH peptides. One capsule a day, usually before bed, and you are done.
Oral liquid
Some vendors sell a dropper liquid instead of capsules. It works the same way, and the upside is you can fine-tune the dose. The downside is you have to measure carefully each time, so capsules are simpler for most people.
Injection
There is no injectable MK-677, and there is no reason for one. The entire point of the compound is that it is orally active. If you want an injectable on the GH axis, that is what Ipamorelin or CJC-1295 are for.
So there is really nothing to decide on route. Capsules by mouth, once a day, is the standard and the simplest. The only real decision is timing, and most people land on taking it before bed, which we cover in the dosing section.
Dosing by goal.
There is no single official dose for MK-677, because it is not an approved medicine. What follows is the range people commonly run. The defining feature of MK-677 dosing is how simple it is: one oral dose, once a day.
Starting out
A common approach is to start at 10 mg once daily for the first week or two. This lets you gauge how strong the appetite and water retention hit before committing to a higher dose, since both can be intense at first.
Standard dose
The widely used dose is 25 mg once daily, which is the level most of the clinical research used. Going higher rarely buys much extra GH or IGF-1, and it does increase the side effects, so most people sit at 10 to 25 mg.
Timing
Most people dose before bed, because MK-677 can deepen sleep and the GH pulse lines up with the body's natural nighttime release. If it disrupts your sleep instead, the roughly 24-hour half-life means a morning dose works just as well.
A lower start lets you judge the appetite and water retention before moving up. Take it at the same time each day.
The dose used in most research. Higher rarely adds much, so this is the usual ceiling. Often taken before bed.
Cycling and timing.
A cycle just means a defined run of time on the compound, followed by a break. For MK-677 the common pattern is a block of roughly 8 to 16 weeks, then time off, rather than running it indefinitely.
Why not just run it forever? Mostly because the long-term human safety data is limited, and because MK-677 nudges blood sugar and insulin sensitivity in the wrong direction. The cautious and widely followed approach is to run a focused block, then stop and let things normalize.
- Hold a steady daily dose through your block, at the same time each day.
- Watch your blood sugar if you can, since MK-677 can raise fasting glucose and reduce insulin sensitivity over time.
- Take a real break after a cycle before considering another. Water retention and appetite usually settle within a couple of weeks off.
Stacking MK-677.
MK-677 is often run alongside other growth-hormone peptides or a SARM cycle. On its own it raises baseline GH; people stack it to add sharper pulses or to lean into recovery.
GH amplification
The most common GH pairing. Ipamorelin gives a clean, sharp GH pulse, while MK-677 holds a higher 24-hour baseline. Different angles on the same goal, though no controlled human trial has tested the exact combination.
View stack →Around-the-clock GH
An advanced GH-axis stack. CJC-1295 and Ipamorelin drive pulses through two pathways, and MK-677 keeps the baseline elevated all day. People layer it for maximum GH activation, but it stacks the side-effect risks too.
View stack →See full recipes, dosing, and how people run them on the stacks page.
Side effects and safety.
MK-677 is generally described as tolerable, but it has a couple of side effects that are so common they are almost expected, plus some metabolic flags worth taking seriously. The ones people mention most often are:
- Big appetite increase. This is the most common effect by far, because MK-677 mimics ghrelin. Great for a bulk, frustrating if you are trying to cut.
- Water retention and puffiness, from GH-driven fluid retention. People often look fuller or a little bloated, especially early in a cycle.
- Lethargy or grogginess, sometimes reported, particularly with a morning dose.
- Numbness or tingling in the hands, a mild carpal-tunnel-like effect that some people get from raised GH.
Who should be cautious.
Some people have clear reasons to be extra careful, or to avoid MK-677 entirely until they have spoken with a licensed provider.
- Diabetes or prediabetes. MK-677 can raise blood sugar and lower insulin sensitivity, so this is a serious concern and a conversation for your provider first.
- Heart conditions. A frailty trial flagged more heart failure on MK-677. Anyone with cardiac risk should be cautious.
- Pregnant or breastfeeding. There is no safety data here, so this is a hard avoid.
- Competing athletes. MK-677 is banned by WADA and will show up as a prohibited substance.
And the universal one: whoever you are, talk to a licensed healthcare provider before starting MK-677. This guide is educational, not a substitute for personalized medical advice.
Where to buy it safely.
This is where a lot of beginners get burned, because quality varies wildly between vendors and the cheapest product is not always the real deal. Our honest take: do not shop on price alone, shop on price plus independent lab data.
- Compare vendors side by side. Price ranges are wide, and the difference between the lowest and highest listing can be large for the exact same compound.
- Look for recent third-party lab tests. The gold standard the community looks for is a recent Janoshik certificate of analysis showing purity for the batch you are actually buying.
- Favor recent COAs. An old lab result on a different batch tells you little. The fresher the test, the more it means.
- Be skeptical of suspiciously cheap listings with no testing behind them, and of capsules that do not state the milligrams per cap.
That is exactly the comparison we put together. On our MK-677 product page you can compare vendor prices, see which batches have public lab data, and view the grades we assign from that data. From there you can head to the buy page to line up your options.
Questions, answered straight.
Is MK-677 legal?
MK-677 is not an approved drug and is not sold for human use. The vendors we compare offer it strictly for research use only. It is also on the WADA prohibited list, so competing athletes should steer clear. Rules vary by country, so check what applies where you are.
Is MK-677 a steroid or a SARM?
Neither, really. It is often sold alongside SARMs, but it does not act on androgen receptors. MK-677 is a ghrelin mimetic that raises your own growth hormone and IGF-1, so it works on a completely different system than steroids or SARMs.
When should I take it, morning or night?
Most people dose before bed, since MK-677 can deepen sleep and the GH pulse lines up with the body's natural nighttime release. The half-life is around 24 hours, so timing is flexible. If it disrupts your sleep, a morning dose is a common fix.
Why am I so hungry and puffy on it?
Both are expected. MK-677 mimics ghrelin, your hunger hormone, so a big jump in appetite is the most common effect. The puffy, bloated look comes from GH-driven water retention. Both usually settle over a cycle, but plan your diet around the appetite.
How long until it works?
IGF-1 climbs within a few weeks, and many people notice deeper sleep and bigger appetite within days. Visible changes in muscle and recovery build slowly, so most people judge it over a full block of 8 to 16 weeks rather than a few days.
Do I need to inject it or mix anything?
No. MK-677 is orally active, so it is taken as a capsule or oral liquid with no reconstitution and no needles. That is part of why people choose it over injectable GH peptides like Ipamorelin or CJC-1295.