Ostarine (MK-2866) – What it is, side effects and benefits

Ostarine, also known as MK-2866 or Enobosarm, is a SARM capable of generating muscle gain and strength with few side effects.

Its initial purpose was to treat diseases that caused muscle loss and osteoporosis.

But without the side effects of anabolic steroids used for the same purpose.

It wasn’t long before they discovered Ostarine’s potential to generate muscle hypertrophy in bodybuilding.

How does Ostarine work?

Being a SARMS, Ostarine binds directly to androgen receptors (on the same receptors of anabolic hormones as the binding of testosterone).

But unlike anabolic steroids, which use the same receptors, Ostarine is not converted into DHT or estrogen.

This means that there are no collateral related to these hormones, such as hair loss, gynecomastia, acne, etc …

On the other hand, just like anabolic steroids, Ostarine is able to increase protein synthesis, which leads to an increase in body mass and muscle strength.

The difference is that Ostarine binds directly to muscles and bones, leaving the rest of the body tissues free from the action of the substance.

What is it for?

Ostarine, in the world of bodybuilding, is mainly used to gain muscle mass while bulking.
You can expect noticeable muscle mass gains, no fluid retention, or fearing side effects like gynecomastia.

Obviously, the same gains that anabolic steroids could generate cannot be expected.

But gains with Ostarine tend to be cleaner (no fat and water buildup) and easier to maintain after the cycle ends.

It is also possible to use this SARM in cuttings, due to its anti-catabolic characteristics in low calorie diets.

Side effects:

The side effects of Ostarine are very mild compared to the use of anabolic steroids.

In fact, most of the steroid side effects do not occur with this SARMS.

The Mk-2688 does not convert to estrogen or DHT.

Therefore, side effects such as hair loss, acne, gynecomastia, retention and high blood pressure are unlikely.

Even though it is an oral substance, it is not metabolized in the same way as steroids and does not cause liver stress.

But nothing is perfect.

Although Ostarine is known not to affect natural testosterone production, there is still evidence that this can happen.

What might need treatment, like a PCT, to reverse the problem.

Even so, the suppression is usually lower than with steroids.

How is a cycle with ostarine

MK-2866 is an orally administered SARMS.

In order to preserve muscle mass while cutting, a minimum of 15 mg per day is usually used.

For muscle gain, most reports show dosages of 20 to 25 mg per day.

Advanced people with high amounts of muscle mass can use up to 30 mg per day.

Also note that most studies show that dosages above 25 mg usually make little difference in men, so the use of 30 mg or more is questionable.

The cycle usually lasts from 6 to 8 weeks with breaks of at least 4 weeks between one cycle and the next to avoid the risk of suppressing natural testosterone.

Ostarine remains in the blood for up to 24 hours, so there is no need to use multiple doses during the day.

Once a day, at any time of the day, is more than enough.


Ostarine is an effective drug for increasing muscle mass, with few side effects.

However, it must be understood that SARMs are not anabolic steroids and that their effects can never be compared.

This means that we must keep our expectations up to date when using these substances.

But even with decent gains compared to steroids, it could be good due to the absence of side effects and the ease in maintaining gains.

The main negative aspect is the cost-benefit analysis.

SARMs are often extremely expensive and extremely counterfeit.

Caution is required when acquiring them.

Aside from that, and if spending a significant amount of money isn’t an issue, Ostarine is a great muscle building drug.


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