Ostarine (MK-2866)

Ostarine, also known as MK-2866 is a SARM (selective androgen receptor module) created by GTx to avoid and treat muscle wasting. It can later on be a cure for avoiding atrophy (total wasting away of a body part), cachexia, sarcopenia and Hormone or Testosterone Replacement Therapy.

This type of SARM cannot only retain lean body mass but as well as increase it. Ostarine is often mistaken as S1 but S1 was created earlier and is no longer going through more expansion.

Benefits of Ostarine

MK-2866 can give you:

  • Increased lean mass gains
  • Better strength
  • More endurance
  • Joint healing abilities
  • Anabolic (even at doses as low as 3 mg)

How Ostarine Works

ostarine-chemical-structureOstarine (Ibutamoren) Chemical Structure

SARMS bind to the androgen receptor (AR) and shows osteo (bone) and myo (muscular) selective anabolic activity. The tying and stimulation intensifies protein synthesis and builds muscle.

Ostarine causes muscle growth just like steroids but it won’t produce negative side effects commonly found in anabolic steroids and prohormones such as prostate and other secondary sexual organs.

MK-2866 uses its anabolic effects on muscle tissue fully so it’s not only a potential for curing muscle wasting ailments but also it has great potential for muscle building for athletes, bodybuilders and fitness buffs. It is also an agent to reduce degeneration during recovery times from serious surgery or similar conditions.

*Ostarine has undergone 8 scientific trials by GTx with about 600 subjects plus 3 efficiency studies. A 4-month Phase IIb medical trial including 159 patients have shown a complete boost in total lean muscle mass compared to placebo and the secondary goal of increasing muscle strength.

In terms of bodybuilding, Ostarine users have proven that MK-2866 can help improve lean muscle mass and strength levels.

This guy’s overview might even explain everything about MK-2866 better…

Uses of MK-2866

For Bulking

Shines best when used for gaining lean muscle (bulking) as it is the most anabolic of all the SARMS. Suggested dosage is 25 mg for 4-6 weeks. PCT is not necessary. An increase of 6 lbs. of lean, keepable gains can be observed during this period.

You can take Ostarine as high as 36 mg for 8 weeks BUT only if you weigh 210 lbs. Suppression is expected in higher doses so PCT after a cycle is a must.

For Recomping

Ostarine shines in recomping due to its nutrient portioning results. Calorie is used to build muscle which helps in weight loss and enhancing muscle mass and strength. Suggested dosing is 12.5-25 mg for 4-8 weeks.

*Your diet must contain 30% of lean sources of protein to achieve the best recomp result.

For Cutting

MK-2866 can help cut whilst preserving muscle gains and decreasing calories. Suggested dosing is 12.5-15 mg for 4-6 weeks.

Ostarine for Preventing Injuries

The effects of MK-2866 convert to anabolism in bone and skeletal muscle tissue, which means it could be used in the future for different purposes such as osteoporosis and as a simultaneous treatment with drugs that decrease bone density. So, it has great use as a compound for injury recovery, specifically bone and tendon related injuries.

Suggested dosage is 12.5 mg a day.

Timing of Doses

MK-2866 has a half-life of 24 hours. Each dose should be taken ONCE per day.

Benefits of Ostarine to other SARMS (S4)

  • Doesn’t have androgenic properties in non-muscle tissue.
  • Metabolite M1 which causes changes in vision (common side effect in S4) isn’t found in Ostarine.

Ostarine Side Effects

MK-2866 is fully side effect free. The only threat is that it’s possible to experience some mild natural test shut down in cycles over 4 weeks, but the time between cycles are only 4 weeks.

Get the Highest Quality MK-2866 for Your Rat

Option #1:


MK-2866 by SARMS1 is formulated based on months of research and hailed to be the strongest, purest MK-2866 on the market.

Buy liquid MK-2866 here.


Ostarine/MK-2866 Review

I was on beast mode when I started using Ostarine. I made some awesome gains as well. There was very little suppression as well. I came across a fellow user’s review stating “…I had some fantastic gains and solid trainings as it gave me the extra strength I needed. Plus, it made my skin look clearer and even looking which is a surprising positive effect…”

Do you wish to try Ostarine? Or have you tried MK-2866? Tell us what you think of it by leaving a comment below.

54 thoughts on “Ostarine (MK-2866)

  1. Teri says:

    I am currently on ostarine and anafuse. This is my first week. I am a 61 yr old female. I Take 15 mg of ostarine with 4 anafuse pills. I have to take ostarine in 5 mg doses at a time. , otherwise I get nauseous if I don’t separate the pills but I have already felt strength an a slight increase in my muscles. I am definitely stronger. I was lifting 55 lbs on chest press an now lifting 60 lbs. I also have never lifted 30 lb dumbells til today. I really like these products an I’m looking forward to these next 6 weeks.

    • PanhandleOperator says:

      I take .5ml of testosterone cypionate per week and just started ostarine and sr9009 yesterday. All of the literature I’ve found so far said it was safe and I expect to see huge gains. I just came off of a pro hormone cycle with an 8lb lean muscle gain.

  2. James Basabe says:

    Yes I wish to try this product so I’m 5’7 I weight right now 180 but I Sally walk around bout 190-195. I lost alil weight n muscle mass do to wk hustling load up my big rig. N unloading it.

  3. dan says:

    this shit is the real deal, prohormones are done, it’s the generation of SARMS now, these are the most powerful legal muscle building supplements. and ostarine is #1

    • mm
      Chris Wallace says:

      I would take a month off, there may be residual effects and testing for SARMs has become more advance over a very short time period. If you plan on taking a PCT for some of the more powerful SARMs, I would account for that too.

  4. Teri says:

    I had to go off of anafuse due to side effect of eye problems. I tried twice went off then on again. Both times same eye problems. I ended the ostarine in Feb. I am now looking forward to going back on it shortly. My strength gains we’re excellent. Chest press went from 60 lbs. to 90 lbs. in 2 months. I gained 3 lbs of muscle. My friends at work think I’ve lost weight. The strength from ostarine is awesome. I can workout for 3 hrs with no problem. I am going to stack with sr9009 an see what happens.

  5. Brit says:

    Took ostarine ran a 6 week cycles while on a cut dropped 10 pounds from 191 to 181 and just stayed there while still leaning out and strength going up. Bench went from 245 to 295
    Deadlift from 305 to 365
    The pumps were good and I had No sides at all

    • Caesar S says:

      Hey. Yes it is. I’ve been all over the weight scale. Good for weight lost and muscle gain. After a full 2 weeks you will see a difference. My advice. Since I was 290 and in decent shape. But when I was 240 and taking pro hormone. I took this and got in shap . You will like it.

    • Caesar S says:

      Yes good for weight lost. Great for lean/muscle gain. 4 weeks of it. Then cycle off asap. I also take milkthiysl one capsule every few days. For liver health.

  6. Ray says:

    Can I use this with a Pre-workout like creatine monohydrate???

    Please let me know… I already purchased some Ostarine and want to know before I start my cycle!!!

    • mm
      Chris Wallace says:

      MK2866 and LGD4033 are very similar chemicals so using those two in a stack wouldn’t really be optimal. I’d suggest MK2866 with S4 for a cutting cycle or LGD4033 with MK677 for a bulking cycle. Of course if you don’t want to stack, they can both be used as a stand alone.

  7. T says:

    I am a 39 yr old female. I have test pellets implanted every 3 months. It gets my test up to 170 and I do Gh injections. I am looking to stack something for toning up and muscle. Would this work or should I look into something else? I need help with this. I don’t want to choose the wrong one.

  8. Bryat says:

    Is Ostarine a steroid? I have sort of hit some stagnancy with my gains and want to find something to help push me beyond. However, I want to remain as “natty” as possible. Ive only ever taken preworkout, aminos, and creatine before and am pretty hesitant with new products. Any advice or info on this product?

    • mm
      Chris Wallace says:

      My first question has to be “has your lab animal had problems with hypoglycemia before?”
      Secondly, studies have shown that the nature of MK2866 lowers the blood glucose level by 11% while simultaneously reducing insulin residence by 27%. Typically this shouldn’t develop into a problem, but for lab animals with prior hypoglycemic issues, this could lead to feeling light headed and fatigued. I would recommend using GW501516 and SR9009 until the condition is under control. You CAN use MK2866 in conjunction with blood sugar stabilizing medications.

  9. Scott Pratt says:

    i Have a Question, where can i buy SARMS? Can someone please send me some info on how and where to buy it. I am super interested in getting started on this……………

  10. Alojamiento web says:

    Nevertheless, as you’ll learn in the next section, Ostarine is still associated with many steroid-like side effects – so you’ll need to be careful with your dosages and post cycle therapies.

  11. Caesar S says:

    Well when using pro hormones and other products like it. It is for muscle gain and weight loss.the benefits. From taking products like these is great while working out everyday. First time I took something similar i seen weight lost… muscle gain/lean . But don’t take after 4 weeks. If your a rookie to the test. The longest i have taken anything like it. Was 5 weeks .I also take milk thisel 1 cap every few days. This is my experience. I’ve been 290 pounds with 22 percent body fat. To 200.pds. I’ve used different pro hormones. And seen a crazy change in my body from head to toe. After 2 weeks you see a change. But.i also was working out at the gym for 1 hour plus.every day or at home 6 days a week. Now trying another product like this. And can wait . See what I can complete the end of my 4 weeks. I stopped working out for long time. So it will be exciting!!!

  12. JoeW says:

    Is this safe for a 21 year old male and a 20 year old female. Also the product we looked at is a 10 MG pill that is to be taken with each meal (3Times a Day). We are looking to get a start on cutting quick. Looking to get more info on how safe the product will be for a female and the results we should look to get when used for cutting.

  13. Lou says:

    I simply want to use this for cutting, so I would look at about 12-15 mg per day. Would I need to worry about pct? Could I do this for 6 weeks, cycle off then go back on 6 weeks after?

  14. Ben Murphy says:

    I have a question. I recently came off of a prohormone cycle called Built Mass Phase 4. Now I am on my pct which is BlackStone Labs PCTV. I have been on my pct for about a week and a half and I’m wondering if it would be safe to run Ostarine for the about 4 weeks and what the recommended dosage would be

  15. Vianey says:

    I am a female trying to improve for my next bikini show. Would you recommend to take MK2866 and GW501516 together? and if so how can i take both of these?
    Thank You!

  16. Stacia says:

    I was just wondering about this website and it not showing up as being a registered site? I was wanting to purchase this product but can you inform me before placing my payment info on here, Thank you!

  17. rat34 says:

    I have purcahsed ostarine and cardarine for trials on my rat.
    well trained, but first time exposure to these research products
    34d old – no prev health concerns
    main aim would be small increase in lean mass, but cut/decrease fat mass mostly.
    could you recommend dosage for 4 week trial
    would there be any recommendations for PCT/AI and/or liver supplementation during/post use
    your help is much appreciated for my research

  18. Andy says:

    Am I right in saying that for a 4 week cycle, at 12.5mg per day , if the dosage bought is at 50mg per bottle,one would require the best part of 7.5 (call it 8) bottles?

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