Ostarine (MK-2866) Review for Muscle-Building [Cutting & Bulking]

Ostarine is generally considered to be one of the cheapest SARMs (Selective Androgen Receptor Modulators) around which is why it has become increasingly popular among bodybuilders and nutraceutical enthusiasts.

Word of mouth about SARMs has been spreading over the last few years thanks to these research chemicals’ potential to burn fat and build muscle without the harmful side effects associated with anabolic steroids.

Ostarine, otherwise known as Enobosarm or MK-2866, was chiefly developed to combat the symptoms of osteoporosis and has been closely studied to this end. It is believed to be helpful in treating muscle wasting and similar conditions.

However, the online community has been largely divided on whether this particular SARM is actually effective for building muscle mass with some calling it a miracle drug and others flat-out debunking it.

Today, we’ll take a closer look at the effects of Ostarine (MK-2866) from Proven Peptides, how it works and why it might be a worthy addition to your own SARMs stack.

Things to Consider Before Buying Ostarine (MK-2866)

Like similar selective adrogen receptor modulators (SARMs), MK-2866 targets a number of developmental factors by binding to receptors within your body and producing osteo- and myo-anabolic activity.

Taken orally, it is said to have some incredible benefits such as building lean body mass, specifically when caused by age-related decline.

Ostarine might be right for you if you’re looking to trim down, strengthen your bones or maximize your workout.

It’s been shown to improve physical function in otherwise healthy senior citizens in a double-blind, placebo-controlled study. Its effects in combating muscle wasting—a condition associated with cancer, chronic obstructive pulmonary disease and end-stage renal failure—has been significant in preclinical studies.

Athletes and bodybuilders may also see incredible results from taking an Ostarine cycle. When combined with strength training and a healthy, balanced diet, you can expect to see a boost in muscle-building effects.

Unlike other SARMs, Ostarine has shown therapeutic promise as a treatment for diabetes. In fact, the Memphis-based pharmaceutical company GTx who coined the Ostarine™ have said that a Phase II clinical trial of sixty geriatric men and sixty postmenopausal women showed a dramatic reduction in insulin and glucose levels after 3 mgs of MK-2866 was administered.

Whereas steroids are generally taken strictly for bodybuilding purposes, MK-2866 or Ostarine acts more like a biohack, something that can benefit anyone who wants to remain in good shape, regardless of whether they’re pumping serious iron or, simply, looking to lose a few pounds before it’s bikini season.

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MK-2866: Pros and Cons

Ostarine (MK-2866) may assist in increasing muscle mass, improving bone strength and fortifying general body composition.

It is available in pill, powder and/or liquid form, and can be safely taken in short and long-term cycles to reap its health benefits.

The ideal supplement for those looking to trim down for the sake of staying healthy while building or sustaining strength, Ostarine should be combined with exercise and a protein-rich diet.

So maybe this sounds like something that’s right up your alley, but before you run out and pick up a bottle, let’s explore the pluses and minuses of this unique SARM.


  • Ostarine is legally available and can be purchased online in the US.
  • It is clinically-proven to reduce insulin and glucose levels in both men and women, particularly in the elderly.
  • It can be taken by mouth without the need for painful injections or consultation.
  • It is a natural supplement that directly stimulates growth hormone, not some detrimental anabolic steroid.
  • It doesn’t cause menstruation or dramatic changes to sexual organs.
  • It increases BMD (Bone Mineral Density).
  • It doesn’t negatively effect blood pressure levels.
  • No serious side effects
  • Not estrogenic
  • It isn’t Andarine and, therefore, does not cause vision problems.
  • It retains nitrogen, preventing against nitrogen wasting.
  • Does not present with the side effects typical of cancer treatments (hot flashes, decreased libido, decrease in physical performance, et al.)


  • May cause mild dry mouth after more than six days of continuous use
  • Can lead to suppression
  • There is insufficient data to determine the prospective long-term effects of Ostarine use.
  • Reportedly has a terrible taste with one forum member posting that it tasted like gasoline and vodka.
  • Other mild side effects have been reported, including headaches, upset stomach and tightness of the chest.

Main Benefits

While studies are ongoing to determine the precise extent to which MK-2866, the fundamental areas in which it can be advantageous to the average user are clear.

Orally supplementing with MK-2866 can improve your health in the following ways:

It changes to anabolim in bone and skeletal muscle, and promotes lean body mass. You could also see your skin tighten in previously droopy areas.

Thanks to MK-2866’s retention of nitrogen, your body won’t break down your muscles for energy conversion if you maintain a healthy diet and regular exercise.

MK-2866 Dosage

The average recommended daily dose is 25 mg for an eight-week period. Some experts suggest that 12.5 to 50 mg per day is an acceptable dosage range.

Personally, I like to err on the side of caution as I only weigh 185 lbs at the moment and I’m 5 ft 11” tall. I usually take 20-25 mg a day and find that it makes all the difference when it comes to kicking out the jams at the gym.

On 25 mg of Ostarine, I can usually crank out multiple reps with little to no immediate exertion. As a matter of fact, the one time I took 30 mg in one sitting, I exceeded my goals for the day and ended up alternating between my usual workout regimen (thirty minutes of cardio, fifteen to twenty minutes with weights) and a half hour at home with the Insanity workout.

I was sore as hell the next day, but a five-day cycle at 30 mg made for some impressive results. I was cut like I hadn’t been in years.

Reviews—What People Are Saying

As I mentioned before, the reaction to Ostarine has been pretty mixed. Apparently, users are divided into two camps—enthusiastic proponents and disappointed naysayers. By and large, the latter group are composed of users who had unrealistic expectations.

The problem that occurs whenever a new supplement hits the market is that people go apeshit over it and the hype becomes over-inflated. In no time at all, people are running out, buying the stuff in bulk and expecting it to be God’s gift to the health and wellness industry.

Unfortunately, Ostarine is not a bona fide “miracle drug” nor are any other supplements you are likely to come across. But with that said, it is clear to see that many have found MK-2866 to be beneficial to their workout routine and/or overall health.

One forum member reported a total lack of gains after using Ostarine, adding that it tanked his libido by the end of a three-week cycle. Another poster said that it had suppression sides with minimal to no benefit.

While some have also said that “Ostarine doesn’t look good,” and have claimed that it increases estrogen and liver enzymes, others have raved about the rad results with one forum member saying, “Ostarine is definitely the way to go, at this time. And there are more and more companies selling it, making it affordable and accessible.”

According to multiple user experiences, one of the biggest drawbacks to Ostarine is the way it tastes with one forum member saying, “It also tasted like the inside of a dead rhino’s a**hole and basically ruined even the taste of water for the next couple of hours.”

Closing Thoughts

Sustaining a strong, healthy body is vital to our longevity.

If you or a loved one are looking to burn calories, gain muscle or you are over the age of 65 and want to protect your bones and muscles, MK-2866 has been shown to be a worthy aid in burning fat and increasing muscle mass.

Before you start an Ostarine cycle, just remember to manage your expectations, exercise regularly and always combine your supplementation with a heart-healthy, protein-rich diet. Be safe and be strong.

Have you tried MK-2866 or other SARMs like it? Please let me know how they worked out for you in the comments below!

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Click Here to Leave a Comment Below 2 comments
Jeff Anderson - September 3, 2017

Ostarine (MK-2866) is legit, I recommend to use it.

Janaba - November 12, 2018

Hey if you have to choose between Andarine and Ostarine, which one will you choose? They are very similar in effect, right? I wanna try one of them. I cannot buy them all, these stuffs quite expensive for my broken-wallet.


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