The No BS Truth About MK 677 (Ibutamoren)

Guy On MK 677

If you’re reading this, it’s probably because you’ve heard about MK 677 and want to know if it’s the real deal.

Well, you’ve come to the right place.

In this article, we’ll cover everything you need to know about MK 677, including:

  • What It Is
  • How Does It Work
  • The Proven Benefits
  • What Type Of Results You Can Expect
  • Dosage
  • Side Effects

In other words, after you read this article, you’ll know whether or not you want to give MK 677 a try.

Just so you know, at no point in this article am I going to preach to you about what you should and shouldn’t put in your body.  It’s your body!

My goal here is simply to help you make a more informed decision in the end, whatever you decide to do.

So, with that said, let’s get to it!

What Is MK 677?

What Is MK 677?

MK 677, also known as Ibutamoren, is a synthetic Growth Hormone secretagogue.

The term secretagogue refers to any substance that triggers secretion of another substance.

In this case, the substance being secreted is Growth Hormone (GH).

GH is a peptide hormone which is released by the Pituitary Gland.  It’s primary function is right in the name:


It stimulates the growth of pretty much all tissues, including muscle and bone.  Mostly, this is due to GH triggering the release of Insulin-like Growth Factor 1 (IGF-1).

Your body secretes a small amount of Growth Hormone normally but this tends to decline with age.

Growth Hormone is approved for certain medical uses (like GH deficiency), but many bodybuilders and athletes use it because they believe it will help them gain strength and pack on muscle.

Increasing Growth Hormone levels is believed to:

  • Increase Muscle Growth
  • Decrease Body Fat
  • Improve Cognitive Function
  • Slow Aging
  • Speed Up Healing Processes
  • Help You Sleep Better

Now, research has shown us that some of these alleged benefits are more real than others, but the average GH-user likely believes all of those things to be true.

To make matters more complicated, quality Growth Hormone is SUPER hard to get!

Either you get it from a Doctor or you roll the dice on some sketchy Chinese manufacturer.  It’s so rare that people who can get it don’t even want to sell it most of the time.  They just want to keep it for themselves!

So, as you can probably imagine, any product that boosts Growth Hormone levels is going to be of interest to A LOT of people.

Needless to say, a lot of supplements have been marketed as ‘GH-boosters’ and most have turned out to be useless.

So, is MK 677 any different?

Yes.  It actually works…

How Does MK 677 Work?

A lot of people consider MK-677 a SARM, but it actually isn’t one.

The term ‘SARM’ stands for Selective Androgen Receptor Modulator, but MK-677 has no impact on Androgen Receptor function.

Instead, it works by mimicking a naturally occurring Growth Hormone secretagogue called Ghrelin and activating Growth Hormone Secretagogue Receptors (GHSR)–also known as Ghrelin Receptors–in the brain.

Ghrelin, sometimes referred to as ‘the hunger hormone’ is responsible for regulating energy balance in a ‘yin yang’ type of way with another hormone, called Leptin (the satiety hormone).

Ghrelin And Leptin Regulate Hunger And Satiety

Before Eating – Leptin levels are low and Ghrelin levels are high.

After Eating – Leptin levels are high and Ghrelin levels are low.

One of the things Ghrelin does is stimulate the release of Growth Hormone.

Since MK 677 mimicks Ghrelin to the point that it actually binds to the Ghrelin Receptors, it too stimulates the release of Growth Hormone.

Interestingly, it does this without influencing other hormones.

This is why it’s kind of unfair that it often gets grouped in with SARMs.  It’s not a Selective Androgen Receptor Moedulator.  It’s a GH secretagogue.

Two entirely separate things.

What Are The Benefits Of MK 677?

The benefits of MK 677 are simply the benefits of increased Growth Hormone.  Unfortunately, there’s actually a lot of confusion about what the benefits of GH actually are in healthy people.

So, let’s quickly run through a few of the alleged benefits of GH, and therefore MK 677, and see how valid they are.

MK 677 And Muscle Building

The most common reason people use MK 677 is to gain muscle.  That’s why it’s made such a big splash in the bodybuilding industry, despite not originally being intended for that at all.

Many people are under the impression that more GH equals more muscle, but that’s actually not the case.

Research indicates that, while GH and IGF-1 definitely play a role in regulating muscle mass, increasing GH beyond the normal range does not actually increase muscle growth.

Even in GH-deficient people giving GH, the increase in strength and muscle is modest at best.

So, while MK 677 definitely increases GH, it’s not going to directly stimulate muscle growth.

In one study, subjects taking MK 677 (at 25mg/day) for 8 weeks experienced a slight increase in fat-free mass (also known as lean body mass), but it’s unclear how much of this was because of increased bone density and how much was muscle.

The study didn’t measure strength or any other measure of physical performance.

slight increase in fat free mass was also observed in a more recent (2008) study as well.  The subjects in this study were over 60 though, so it doesn’t tell us anything about how MK 677 may do for younger people.

Furthermore, the length of the study was a whole year, making the slight increase in lean mass even less impressive.

MK 677 may help build muscle in older individuals (with declining GH levels), but the impact isn’t even that great.

You could argue that since IGF-1 stimulates your appetite and MK 677 increases IGF-1 levels, that MK 677 could allow you to eat more, thus helping you gain muscle, but that’s not a direct effect.

In young, healthy people, it’s unlikely that MK 677 will have any kind of direct impact on muscle or strength.

That doesn’t mean it’s useless though.  There are other benefits…

MK 677 And Muscle Preservation During Calorie Restriction

As I said earlier, MK 677 wasn’t originally developed to help people build more muscle.  That’s not something that drugs get approved for because it’s viewed as purely cosmetic for the most part.

Preventing people from losing muscle though.  Now that’s a different story…

There are a ton of diseases which are characterized by muscular wasting, either because of a direct effect of the disease or inability to eat in people who have the disease.

Either way, there are legitimate health reasons why one might take a drug that preserves muscle mass.

Growth Hormone treatment has been shown to preserve muscle in instances of dietary restriction, so naturally, MK 677 has been investigated for this as well.

Not much research has been conducted in this area, but the research that has been conducted is promising.

MK 677 has been shown to preserve muscle mass during severe caloric restriction.  That’s not particularly surprising though.  It increases GH and as we just discussed, GH is known to do that.

So, will MK 677 help you gain lean muscle and strength?  Not really, but it can definitely help preserve muscle while cutting when muscle would ordinarily be lost.

MK 677 And Sleep Quality

Growth Hormone is known to play a role in regulating sleep.

GH itself has been shown to improve various aspects of sleep, so it makes sense that some of the research on MK 677 looked specifically at how it impacted sleep.

Research shows MK 677 can improve sleep quality and increase the time spent in REM sleep.

Sure, you could argue that it’s only been shown to do so in one study, but we already know that GH is highly correlated with sleep quality, and that MK-677 increases GH, so it’s not much of a stretch to say that it improves sleep quality as well.

If you take a good look around the internet, you’ll find a lot of anecdotal reports that support this notion.

While these types of subjective reports should always be taken with a grain of salt (the placebo effect is VERY real), there’s a good chance MK-677 can help you get a better nights sleep.

Still, another study or two would be nice…

MK 677 And Bone Health

Growth Hormone plays an important role in bone formation and maintaining optimal bone health.

GH treatment has been shown to increase mineral density, partially through an increase of IGF-1.

Given the obvious role of GH in bone growth and maintenance, it makes sense that some of the research on MK 677 would look specifically at how it impacts bone health as well.

Treatment with MK 677 has been shown to increase mineral density and bone remodeling in healthy (older) adults.

Out of all the benefits MK 677 has to offer, improving bone health actually appears to have the most research behind it.  If you have osteoporosis or any other kind of bone-deteriorating condition, you may benefit from MK 677.

What Kind Of Results Can You Expect With MK 677?

MK-677 Results

When using MK 677, it’s important to set realistic expectations.

If you think you’re going to suddenly blow up and get super jacked, you may be disappointed.

Don’t get me wrong…

You can definitely gain some weight on MK 677, but how much actual muscle you end up building will largely depend on how you workout.

You can’t expect MK 677 to directly stimulate muscle growth, but you can expect it to:

  • Increase Your Appetite
  • Help You Sleep Better
  • Preserve Muscle (If You Were To Cut Your Calories)

There are also anecdotal reports of MK-677 having healing properties and improving skin health, but these benefits remain unexplored in a clinical setting.

MK 677 Dosage

MK 677 Dosing

Although the research on MK-677 is still in the early stages, we do know that 25mg/day is an effective (clinical) dose, based on the studies we discussed earlier.

No studies have used lower doses though, so it’s possible that lower doses are still somewhat effective, just as it’s possible that higher doses are even more effective.

More studies are needed to determine an ideal dosage, but for now, stick with 25mg/daily.

At that dose, we know MK 677 works and, perhaps more importantly, we know it’s pretty safe (well tolerated in studies, no reason to suspect harm).

In one study, subjects took 25mg/day for 12 months with no adverse effects reported by healthy subjects.

The average MK 677 cycle is around 8 weeks or so, but since it doesn’t suppress the body’s natural ability to produce GH, there’s no real reason to cycle off.

It’s not like a steroid or SARM that shuts down your natural Testosterone production.  MK-677 has no impact on your sex hormones, just GH and related hormones (like IGF-1).

When Should You Take MK-677 For Best Results?

When Should I Take MK-677?

Timing isn’t particularly important with MK-677.

This is because the half-life is pretty long (around 24 hours).

So, as long as you’re taking 25mg (or whatever dose you choose to take) roughly every 24 hours, there will be a constant build-up in your system.

Some people like to take MK-677 before bed because your body secretes Growth Hormone while you sleep.  For that reason, it make sense to take something that boosts GH before bed.

But again, given the abnormally long half-life of MK-677, it probably doesn’t matter much when  you take it.

Does MK 677 Have Any Side Effects?

MK 677 has been pretty well-tolerated throughout most of the studies, but there are some potential side effects to be cognizant of.

One thing that’s worth point out is that MK 677 may reduce insulin sensitivity and increase blood sugar.

The impact isn’t likely to be massive, but if you have issues with insulin sensitivity or a pre-existing condition like Metabolic Syndrome or Diabetes, you may want to stay away.

In one study, some elderly subjects (over 80 years old) experienced heart failure, but these subjects had a pre-existing condition (and they were really old).

Other than that, there haven’t really been any reports of adverse health effects with MK 677 in particular, but we can assume the side effects are the same (though perhaps not as severe) as actual Growth Hormone injections.

This includes things like:

In healthy individuals, there’s no evidence that MK 677 is particularly harmful in the short-term, but the notion ‘MK 677 is completely harmless’ seems like wishful thinking.

There are potential side effects with any drug and MK 677 is no exception.

Is MK 677 Legal?

Is MK-677 Legal?

If you’ve been doing your research on MK 677, you’ve probably read that it’s “perfectly legal” and “available over the counter” in the US.

While it’s true that it’s perfectly legal to buy, sell, and possess MK 677, it cannot be sold as a dietary supplement.  Technically, it’s an unscheduled drug.

That means any company that sells an MK 677 product that’s intended for human consumption is breaking the law.

So, you can’t buy it?  Not so fast…

This is America, remember?  There’s always a loophole.

This particular loophole is used for a ton of different drugs and, given the way our laws work here in the US, it doesn’t look like it’ll close up any time soon.

What am I talking about?  Research Chemical sites!

These are websites that sell unapproved drugs and various chemical substances which are allegedly for “research purposes only” and “not for human consumption“.

Obviously, this is a bunch of nonsense.

But if you want to try MK 677, it’s great news!  It means you can buy it online without having to worry about breaking the law.  You just have to find a reliable research-chem site.

Where To Buy MK 677

There was a time when MK 677 was available in the form of ‘dietary supplements’ but it turns out the companies that sold it as such were breaking a few laws.

Now, it’s available from online research chemical vendors.

Most of these guys sell it in the form of a solution (liquid) that allegedly contains some amount of milligrams per milliliter.

Personally, I’m not a fan of the liquids though because it’s difficult to measure, usually tastes terrible, and could easily contain less than the stated dosage.

And then there’s the issue of trust…

Let’s face it.  Most research chemical sites are shady.  They under-dose and over-price their products and don’t offer anything that even resembles customer service.

If you know of any other reliable places to buy MK 677, feel free to leave a comment below.

My Personal Opinion On MK 677

I think MK 677 is hands down one of the most intriguing compounds to come out of the whole SARM trend, even though it’s not technically a SARM at all.

Some of the claims made about it are completely false though.

It doesn’t directly stimulate muscle or burn fat but, by increasing IGF-1 levels, it will probably make you eat a lot more.

If you’re trying to gain weight, but have trouble eating enough, MK 677 could be very useful.

I personally have never used it because I don’t have trouble gaining weight, nor do I want to get much bigger than I already am (maybe just a little more cut).

The muscle-building benefits of having higher Growth Hormone levels have been severely exaggerated by the media and bodybuilders who don’t really understand what they’re doing.

Increasing GH levels won’t magically help you pack on a bunch of muscle, but it may help you gain the weight necessary to do so by stimulating your appetite.

Also, sleeping better is definitely a plus!

If you’re looking for a GH-booster that actually works, MK 677 is it.  Just don’t automatically assume that more GH equals more muscle.  That’s not how it works!

The Bottom Line On MK 677

The Bottom Line On MK 677

MK 677 is a Growth Hormone secretagogue that actually works.  It has been shown to increase GH and IGF-1 levels quite significantly and appears to be pretty safe.

A ton of substances are marketed as GH-boosters, but MK-677 is one that is actually deserving of the title.

It’s important to understand though, that a lot of the claims made about Growth Hormone, particularly with regards to muscle-building, aren’t actually true.

MK 677 won’t directly stimulate muscle growth because GH doesn’t do that, but there are some other benefits associated with increased GH levels that may make it worth your while.

If you’re looking to get bigger, it can definitely help by stimulating your appetite and you may notice that you get deeper, more restful sleep as well.

I’ll be keeping an eye on MK 677 or similar compounds to come and will be sure to update this article with any more studies that surface.

By the way, if you have any questions, I’m always down to talk supplements.  You can find me on Instagram and Twitter.

Got Anything To Add About MK-677?  Comment Below.

I’m Matt Theis, founder of SuppWithThat, Momentum Nutrition, and Singular Sport. I created SWT to separate the science from the hype and publish accurate, research-based information on supplements. If you like what I have to say here, feel free to check out my supplements at and

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