Ostarine Dosage Guide: For Building Muscle and Losing Fat

  • By: Dave Moffat
  • Date: October 14, 2022

Ostarine, or MK-2866, is a selective androgen receptor modulator (SARM) that was developed by GTx Inc. in an attempt to treat muscle wasting conditions such as cancer and AIDS.

However, it has since found its way into the bodybuilding world as a potent tool for building muscle and losing fat. But how much should you take? And what’s the best way to cycle it?

In this article, we’ll cover everything you need to know about dosage and cycling protocols for ostarine. So let’s get started! 

In case you don’t know what Ostarine is it’s a SARM that was created to help people with Muscle Wasting Diseases but has become popular among fitness enthusiasts for the purpose of gaining Lean Muscle Mass Whilst Burning Fat Simultaneously as it attaches selectively to AR meaning that like testosterone.

It exerts anabolic effects in muscles whilst not adversely affecting things such as hair follicles, prostate & sebaceous glands like traditional steroids do meaning there’s significantly less risk of nasty side effects cropping up.

This makes it far more attractive than other options available on the market right now for those looking to cut down while preserving their hard earned muscle mass.

Dosages however can be confusing due to a lack of scientific consensus so hopefully this guide will provide some clarity!

The Best Ostarine Dosage

Determining the best Ostarine dosage can be tricky. The cycle lasts from six to eight weeks, and your body will need post-cycle therapy or PCT after you finish taking it. But don’t worry, we’re here to help.

Here’s everything you need to know about finding the right Ostarine dosage for your needs.

Bulking Dosage

If you’re looking to bulk up, your Ostarine dosage will typically be around 20-30 milligrams per day for six to eight weeks.

This is considered a moderate dose and will help you gain lean muscle mass without any significant side effects.

Cutting Dosage

If you’re looking to cut down on fat and build some muscle, you might be thinking about using Ostarine. But what’s the best dosage to take?

Well, it depends on your goals. If you’re just starting out, 10-15 mg per day is a good place to start. However, if you’re looking to really shred some fat, you might want to consider mixing Ostarine with Cardarine.

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This combo can help you lose fat effectively and build some lean muscle mass in the process. So, if you’re serious about cutting down on body fat, be sure to give this powerful combination a try.

Body Recomposition Dosage

recomping is different than cutting or bulking. While cutting you’re trying to lose fat and while bulking you’re trying to gain muscle, recomping is the process of doing both simultaneously.

To recomp effectively you need to be eating at a slight calorie deficit while also lifting weights and doing cardio. This can be a difficult task for some people which is why they turn to supplements like ostarine and cardarine.

Ostarine is a sarm that helps with both muscle growth and fat loss and when taken at the proper dosage can help you recomp effectively.

The recommended dosage for ostarine is 12-25mg per day and for cardarine it’s 15mg per day. When taken at these dosages you should start to see results within a few weeks.

The Safest Ostarine Dosages

There is no definitive “safest” Ostarine dosage, as this will depend on your individual goals and tolerance. However, some general guidelines include:

For bulking purposes, a moderate dose of 20-30 mg per day for 6-8 weeks is considered safe and effective.

When it comes to cutting or recomping, lower doses of 10-15 mg per day may be more appropriate.

Overall, it is important to start low and gradually increase your dosage based on how your body responds, to minimize the risk of side effects and achieve the best results.

So whether you are bulking, cutting or recomping, always be sure to talk to your doctor or another healthcare provider before starting a new Ostarine regimen, and carefully follow the recommended dosage guidelines.

Dosages used in Studies and Human trials

Researchers have conducted several clinical trials to assess the safety and effectiveness of Ostarine, as well as its optimal dosage range.

In one such study published in 2014, researchers found that dosages of 12.5 mg per day were safe and effective for increasing lean body mass and reducing fat mass.

Another study, published in 2015, examined a higher Ostarine dosage of 25 mg per day over an eight-week period.

The results showed that this dose was also effective at increasing lean body mass while reducing fat mass without any serious side effects or adverse events reported among participants.

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Based on these findings, it appears that a moderate Ostarine dosage of 12.5-25 mg per day is generally considered

What dosage you should take

will depend on your individual goals and needs. If you are looking to bulk up, a moderate dose of 20-30 mg per day for 6-8 weeks is often recommended.

If you are looking to cut or recomp, a lower dosage of 10-15 mg per day may be optimal. It is also important to start with a low dose and gradually increase as needed, in order to minimize side effects and achieve the best results.

So whether you are bulking, cutting or recomping, always consult with your doctor or healthcare provider before starting an Ostarine regimen, and carefully follow the recommended dosing guidelines for optimal results.


Ostarine is a powerful supplement that can help you achieve your body recomposition goals by helping you build muscle and burn fat at the same time.

To maximize results, it is important to take the recommended dosage and follow other best practices such as incorporating regular exercise and a healthy diet into your routine.

With proper use, Ostarine can be an effective tool for improving body composition and achieving all-around health and wellness.

Dave Moffat

Hi, I'm Dave Moffat the founder and Chief Editor of steroidsourcetalk.com and certified International Personal Trainer and Certified Nutritionist. My passion has always been bodybuilding but with 15 years' experience in weight loss programs too, it's hard not to mention all that when you're working at your fitness level fullest (I hope). When Im not in the gym or spending time away from my family i often think about what advice would help others achieve theirs goals just like these inspired mine.