Ostarine Dosage Guide: What’s the Safest MK-2866 Dosage?

Ostarine Dosage Guide

So, it's your first Ostarine MK 2866 cycle and you want to know what your dosage should be. I was exactly in your shoes some 10 odd years ago when I did my first cycle.

Ostarine is a powerful selective androgen receptor modulator, and the allure is strong. It can help you build lean muscle mass, shred body fat, and get muscle growth rivaling all but the most powerful anabolic steroids. What dosage should you take, though?

In this article, we'll cover:

  • The Safest Dosage
  • Best Dosage for Cutting
  • Best Dosage for Bulking
  • Minimum Effective Dose
  • Maximum MK 2866 Dosage
  • …and more

So, if you're trying to take MK 2866 safely to reduce body fat and build lean muscle, and need to know what your ideal dosage is, then keep on reading to learn more.

Clinical Research

Ostarine Dosage Research SARMs Facts

Before we start getting into what dosages of Ostarine MK 2866 the bodybuilding community takes, we should first explore what the actual clinical trials show us about dosing Ostarine.

According to research, the maximum dosage of Ostarine MK 2866 that's ever been administered in clinical trials, under the supervision of a doctor, was 3mg/day. [R]

Every test subject responded favorably and put on large amounts of lean muscle mass in a very short period of time. Unlike anabolic steroids, they experienced no side effects.

Now, just because they only administered 3mg of Ostarine MK 2866 in clinical trials, does not mean that you can't take more. Now we must turn to the bodybuilding community.

Best Ostarine Dosage

Thankfully, where the clinical data is lacking, there's a bodybuilder who has tried it and reported his results back so the community can learn from forums and blogs.

Anecdotal research suggests that Ostarine is safe up to 50mg/day, although this has not been confirmed by research studies. Fitness enthusiasts typically take anywhere from 10mg to 50mg.

Here is the general consensus on Ostarine dosages:

  • Minimum Effective Dosage: 3mg/day
  • Maximum Dosage: 50mg/day
  • Ideal Dosage: 10-20mg/day

If you want to enhance muscle growth, get muscle mass gains faster, improve bone density, and shred off body fat, typically the best Ostarine MK 2866 dosage will be 10-20mg/day.

That being said, this will vary depending on your goal.

Safest Dosage

The safest Ostarine MK 2866 dosage is technically 3mg/day, as that's what's been proven to increase lean muscle mass and prevent muscle wasting in clinical research studies.

That being said, I'm not aware of a single bodybuilder that's reported adverse effects from taking Ostarine MK 2866 at a dosage such as 10mg/day.

10mg/day of Ostarine is generally considered the “bare minimum” to get:

  • Faster Muscle Regeneration
  • Enhanced Physical Endurance
  • Iron Hard Muscles
  • Increased Lean Muscle Mass

Of course, if you want to burn fat and enhance lean muscle building even more, you can take a dosage of MK 2866 all the way up to 50mg/day.

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Bulking Dosage

Because Ostarine MK 2866 is typically taken to enhance lean muscle mass gains and to burn fat, it's not really the best bulking compound by itself. If you're trying to do a bulking cycle, you should combine Ostarine with another SARM like RAD 140.

That being said, the best Ostarine MK 2866 dosage for bulking would be 20mg/day. This will not only help with muscle growth and muscle tissue recovery, but also losing body fat.

Taking 20mg of Ostarine MK 2866 daily you can expect:

  • Significantly Enhanced Muscle Building
  • Drastically Different Body Fat Levels
  • Minimal Testosterone Suppression
  • Largely Increased Bone Density
  • Much Better Physical Function
  • …and more

While Ostarine is not typically a bulking compound, it stacks very well with bulking compounds, because by promoting fat loss it helps you with gaining muscle, but ensures that it's all LEAN muscle mass, so you get bigger, but stay shredded at the same time.

Cutting Dosage

If your main goal isn't increasing muscle mass with Ostarine MK 2866, but rather speeding up fat metabolism and accelerating fat loss, then the best Ostarine MK 2866 dosage 10mg/day.

Taking 10mg/day of Ostarine MK 2866, you can expect:

  • Increase in Lean Body Mass
  • Minimal Muscle Loss While Cutting
  • Accelerated Protein Synthesis
  • Lose Body Fat Extremely Rapidly
  • …and more

Ostarine is great if you want to regulate body fat levels, because it will naturally help you pack on lean mass and improve body composition, without even having to hit the gym (although obviously you will get way more muscle gain if you also hit the gym, too).

Recomposition Dosage

What if you not only want superhuman muscles and muscular growth, but also to shred off that annoying subcutaneous fat (belly fat)? In that case, 15mg/day is best for you.

While taking Ostarine at 15mg/day, you can expect:

  • Increased Muscle Mass, Even on Calorie Deficit
  • Improves Lean Body Mass
  • Bone Density & Mineral Density Increases
  • Rapidly Build Muscle Mass
  • …and more

Ostarine is a great performance enhancing drug, and just 15mg/day is enough to aid in muscle building and stop muscle wasting on a cut, while also avoiding any adverse effects

Maximum Ostarine Dosage

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Maybe you've taken every selective androgen receptor modulator in the book, are no stranger to anabolic steroids and post cycle therapy, and you want the maximum MK 2866 dosage.

Personally I DO NOT RECOMMEND THIS! That being said, the maximum dosage of Ostarine MK 2866 is generally considered to be around 100mg/day, but this is very dangerous.

Selective androgen receptor modulators are relatively new compared to anabolic steroids, which means we don't fully understand all the long term side effects.

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Taking 100mg/day of Ostarine MK 2866 could seem fine, but in 30 years we find out it has major effects on your body. Either way, after around 50mg/day most people report a serious increase in side effects, without enough muscle gains and fat loss to justify them.

After 50mg/day of Ostarine MK-2866 side effects drastically increase:

  • Gynecomastia (Breast Cancer) Risk Rises
  • Joint Pain (From Gaining Muscle Too Fast)
  • Bone Fractures (Again, Gaining Muscle Too Fast)
  • Testosterone Production Plummets
  • Stressed Liver & Internal Organs

Generally speaking, you should NOT take dosages this high. Don't say I didn't warn you.


In short, Ostarine MK 2866 is a great way to increase muscle mass and avoid muscle mass while cutting. It's a very versatile SARM that is one of my personal favorites.

When taken within a healthy dosage, testosterone suppression is minimal, although I always recommend you do a post cycle therapy for any SARMs regardless of suppression data.

Remember that Ostarine MK 2866 is still an investigational drug being researched to help treat muscular dystrophy in cancer patients, so more research is needed.

That being said, taking 10mg/day is generally considered to be extremely safe, and will lead to increased bone density, muscle gains, strength, and more.

LEGAL DISCLAIMER: The information on this page is intended for entertainment and information purposes only. It is not a substitute for professional medical advice. Always check your local jurisdiction’s laws before buying anything or doing anything.