Ostarine (MK2866)

Ostarine (MK2866)


Ostarine (mk2866 or Ostabolic) is a popular SARM (selective androgen receptor modulator) which is currently used by athletes, from regular gym rats up to Olympians, to give them a boost in their performance.  It can help you gain lean muscle, give decent strength, repair soft tissue injuries, and help protect muscle, without causing horrible side effects like steroids will.  In this article, I will show you how best you can utilize it no matter what your fitness goals happen to be. 

Image Name Promotion Ratings Buy Now
Winnibol 10 Buy 2 Get 1 FREE! 5-stars1 Add To Cart
Ostazol (M1-MK) Buy 2 Get 1 Free 4-stars1 Add To Cart

History of use

ostarine for sale

Ostarine is one of the SARM’s that are still in clinical testing by GTX Pharma. It was first developed by one of the biggest pharmaceutical companies in the world Merck.  They wanted to develop something with low side effects that could help with muscle and bone wasting.  It has also shown promise for urination problems and has been studied to help muscle wasting in those with lung cancer1

Use in fitness

The most challenging thing in weight training, especially as you put in years of wear and tear, is the recovery aspect and the trauma that is being put on soft tissues.  The truth is weight training is brutal on our bodies and puts a lot of pressure on our joints.  One of the amazing benefits we have learned from using MK2866 is that it can actually heal these nagging injuries instead of covering them up by strengthening your soft tissues as your muscles get stronger.

Just like all SARMs, Ostarine has the ability to bind to the androgen receptors, meaning you build more lean muscle mass without causing nasty side effects that you would get from anabolic steroids.  The secret is that it is selective in nature, so it will not cause problems with your reproductive system, or cause androgenic side effects which hurt organ health. 2

mk2866 results before and after

Here are the benefits of Ostarine Ostabolic (mk2866):

  • Strengthens and repairs joints and soft tissues
  • prevents muscle loss while you are cutting down or while stressed
  • helps you gain pure and lean muscle mass
  • helps you gain mild strength


The half-life is around 24 hours so once a day dosing is perfectly fine. 

Detection times and doping

The detection time is listed at around 1 month but the truth is we really aren’t sure.  If you are a tested athlete you should be very careful as you could get caught using it and many leagues and federations are watching for SARM’s use as they become more popular.  In fact, we have seen many high profile athletes busted for Ostarine recently.  UFC fighter Sean O’Malley was suspended for 6 months for using it back in 2019.  Later that summer Taylor Lewan, known as one of the dirtiest NFL players, was busted for it but claimed it was an accident. 

Side effects

mk2866 side effects and alternative

MK2866 is not known to cause many side effects.  If you run it longer than 4 weeks you can expect very mild suppression.  You should follow the cycle up with a mini-PCT using a light dosage of Nolvadex or Clomid and a strong Testosterone booster. 

Overall if you experience strong side effects on it then you are likely getting a fake product. 

Dosages in bodybuilding and stacking

Ostarine is extremely versatile.  Many athletes will use it as part of a SARM’s stack, while others will use it in an anabolic steroid stack.  You can also use it during a PCT (post cycle therapy).  A typical dosage is going to be 25mgs a day (90% of users choose this dosage), but some will go up to 50mgs a day or drop it down to 12.5mgs a day. 

ostarine cycle dosages

Triple stack: 

This is the legendary SARM’s stack which will put on quality lean muscle mass, increase endurance, and get you a nice physique in 8-12 weeks WITHOUT nasty side effects.  With this, you would stack in S4-Andarine and GW501516-Cardarine.  This stack is great for recomping, meaning gaining muscle while losing fat at the same time.


If you want something to help you with joints then stack it with Nutrobal-MK677 along with deloading in the weight room.  

Bridging or post cycle: 

It can be used during this phase because it is not suppressive if ran at 25mgs or less for 4 weeks or less.  It will help you keep your gains and motivate you to workout.  I also recommend stacking in a strong Testosterone booster such as N2generate ES. 

Female use

Ostarine Ostabolic (mk2866) is a great SARM for females to use.  The dosage varies from 12.5mg to 25mgs but many females can get great results on the bottom end of the range and you can stack it with another SARM.

3 biggest myths about Ostarine Ostabolic (mk2866)

1. Ostarine is weak: If your goal is to add 50 temporary pounds to your bench and 30 pounds of fat and water to the scale then it isn’t for you.  You should choose steroids instead, but with all due respect, this does not make Mk2866 weak because not everyone wants side effects steroids give you or sloppy gains.  

Discuss here.

2. MK2866 cannot be used solo:  Not sure who came up with this lie, but it is false.  Many people have run it by itself and had outstanding results. 

Discuss here.

3. Ostabolic will cause shutdown: Legit product is actually minimally suppressive as long as you run it correctly.

Discuss here.

buy ostarine

Ostarine Ostabolic (mk2866) is in a grey area when it comes to legality in the United States.  You can purchase it as a research compound but many processors and websites will not allow transactions to be made for it.  This means a lot of grifters out there will try and steer you in the wrong direction to buy a fake product.  I recommend and to find a trusted source. 

It is not an expensive product to run.  A month’s worth should run you well under $75 per month.

  1. WO2005120483A2: Selective androgen receptor modulators and methods of use thereof []
  2. The selective androgen receptor modulator GTx‐024 (enobosarm) improves lean body mass and physical function in healthy elderly men and postmenopausal women: results of a double‐blind, placebo‐controlled phase II trial []
About author


Steve Smi is a former competitive endurance athlete and powerlifter. He has been weight training for over 25 years and studied PED's for more than 15 years. He moderates 4 fitness forums, has written over 1000 articles, published over 4 books, and has interviewed Mr. Olympia Champions, including Frank Zane, in his over 400 published podcasts. In his spare time, he enjoys gardening, family, fishing, movies, and the outdoors. He is an advocate of giving back to the fitness community and sharing knowledge so everyone can better themselves. Ask Steve a question here.

Leave a Reply

Your email address will not be published. Required fields are marked *