Ostarine (MK-2866) Review: Benefits, Dosage, & Side Effects

If you're looking to improve your appearance and gain muscle mass, you may be considering a range of supplements.

Many athletes and bodybuilders are now using selective androgen receptor modulators (SARMs) to stimulate muscle growth.

Ostarine is one of the most popular and good SARMs for lean muscle mass currently available on the market.

In this review of Ostarine, we'll take a closer look at the substance, its results, doses, side effects, and other core elements.

What is Ostarine MK-2866?

Ostarine is a selective androgen receptor modulator (SARM) that was originally developed by a Tennessee-based pharmaceutical company called GTx Inc.

The primary purpose of the drug Ostarine is to increase the muscle mass and prevent muscle wasting of its users [R]. While it's common with individuals who are bodybuilding or looking to gain muscle for athletics, there is also some evidence that it might be suitable for treating osteoporosis.

As a SARM, Ostarine's primary purpose is to mimic testosterone. People compare its effects on androgen receptors to that of steroids, for example, although these two types of drugs are different in chemical composition and side effects. Many people believe that it's a safer and less intensive version of steroid therapy.

NameOstarine MK-2866
EffectsIncreases lean muscle mass
Potential Side EffectsHeadache, back pains, hormone issues can occur due to higher rates of Estradiol in the bloodstream
Half-Life24 hours
Common Dosage10 - 30 mg daily
Content25mg/ml - 50 ml
Money Back GuaranteeCase-by-case
Rating⭐⭐⭐⭐☆ 4.4/5
Best VendorClick Here ›

Ostarine is used throughout the bodybuilding community, but it is not yet approved by US authorities. If you want to purchase it, it's only available for experimental use. For those who are interested in the chemical structure of the product, the code is C19H14F3N3O3.

What Does It Do to the Body?

Ostarine's primary purpose is to enhance an outward brawny appearance and to increase lean muscle mass.

It is the reason the product has become so popular with athletes that are seeking a competitive advantage. It is also thought that it can improve your vascularity and other outward-facing muscle characteristics.

The aesthetic benefits of Ostarine are one of the primary reasons this product has become so popular within the bodybuilding community. There have even been clinical trials on cancer patients to help them regain lean muscle mass.

Another benefit is an increase in muscle density [R]. If you are aging or feel that your lean muscle density is naturally declining, using a SARM might be a suitable boost to your current density levels.

SARMs are considered a steroid by most athletic regulatory bodies, though. Professional athletes will need to make sure it is an approved substance for their particular sport or competition before using it as a workout aid.

Results & Benefits

In terms of muscle building results, the outcomes when using Ostarine are clear.

Users boast excessive muscle growth throughout and after cycles.

Ostarine has become a widely used drug because of its obvious outward effects.

It isn’t only a product that helps build and maintain muscle mass, though.

Ostarine is also focused on providing you with external aesthetic benefits.

If you want to improve your vascularity and 'pump,' this is an excellent option.

One of the primary benefits of Ostarine is that it isn't thought to have the same negative consequences as steroids.

Modern steroid products often result in a range of serious health issues, including severe liver damage.

There is also evidence that suggests traditional treatment of this kind can severely suppress your testosterone levels, which may result in ‘man boobs’ and a host of other negative consequences.

While SARMs haven't been studied at the same level as anabolic steroids, the current evidence suggests that many of the known side effects are less severe.


If you're planning on taking Ostarine, it's important to stick to the correct dosage levels and treatment plan.

Most Ostarine packaging will have information on dosing, but this varies depending on the supplier that you're using. It's usually taken in cycles—in the same way that many athletes take other treatment cyclically (it's quite common for users to take eight to twelve-week cycles).

Dosages vary, but many people taking this for muscle mass purposes will use between 10mg and 30mg.

If you want to find out which dosage is most suitable for your needs, speak to a health professional before you consume any Ostarine or start a long-term cycle.

If you are wondering what type of dosages have been tested in a controlled setting, the level of intake is typically much less than what bodybuilders use.

There does not appear to be extensive research performed on higher doses of this particular product.

Be warned; as your dose increases, your testosterone levels may also take a more serious hit.

It can have negative consequences for when you stop your Ostarine cycle.

Many people take lower dosages or undertake PCT (post cycle therapy) when they stop their cycle.

Side Effects

Ostarine is not approved for general use by the US Government, so it's extremely important to be aware of the potential side effects associated with this product.

In this portion of our review, we'll take a closer look at some of the side effects of Ostarine that you may experience if you consume this drug:

  • Headaches.
  • Hormone issues can occur due to higher rates of Estradiol in the bloodstream.
  • Back pains.
  • Women who take the product may suffer from different menstruation patterns.

After taking a full Ostarine cycle, some users also reported:

  • feeling muscle pain.
  • feeling joint pain.
  • having nightmares during cycles.
  • interrupted sleep cycles during Ostarine cycles.

Research is still being conducted on Ostarine.

It's important to keep up to date with potential side effects and risks associated with Ostarine.

SARMs are not approved for human use, but there have been numerous studies on human subjects using the drug—it still hasn’t reached the approval stage, though.

If you have any health conditions, avoid this substance until its full health effects are known.

What's the Best Place to Buy Ostarine?

If you want to buy Ostarine, it's best to avoid black market channels or unreliable suppliers.

There is a range of reputable SARMs vendors that you can use to purchase this drug.

You will need to buy Ostarine online, so it’s essential to perform due diligence on your supplier and source the products from a reputable outlet.

We recommend that you use Chemyo.

Feel free to check out the wide range of SARMs and supplements.

The site also has an extensive directory of options online and ship products directly to your front door.

Frequently Asked Questions (FAQ)

This is an increasingly popular product, and we receive many questions about different aspects of this drug.

Below, are some FAQs:

How Long Can You Run Ostarine?

If you want to take Ostarine, most people administer a cycle that runs between eight and twelve weeks. It is the most common 'run' that people undertake when they use this drug every day. If you are wondering what is most suitable for your particular needs, it might be best to speak to a health professional about the length of consumption standard for your requirements.

Is Ostarine Banned by WADA?

Ostarine is currently on the WADA prohibited list. If you compete in a sport that is governed by WADA, you will not be able to take this substance. It's crucial to keep an eye on the WADA list of substances if you want to avoid issues with any of the supplements that you consume.
No matter what governing body your competition falls under, if you must take a drug test to compete in your sport, this will not be a suitable option in most cases.
It appears that some supplement companies have been secretly placing Ostarine in non-anabolic supplements, too. Some athletes have been failing drug tests for steroids after taking treatment. It's important always to check the reputability of the source of your supplements if you want to avoid mistakenly failing a WADA drug test.

Does Ostarine Build Muscle?

Ostarine's primary purpose is to build muscle and strength. Results will vary, depending on your workout regime and personal body composition, but there is ample evidence that suggests it is extremely effective at helping you build and retain muscle mass. It can also improve the outward appearance of your muscles.

Do You Need A PCT?

Once you finish your cycle, you may be wondering if you will need to undertake any PCT. There is mixed information about the need for PCT after an Ostarine cycle, but it is essential to note that some users experience a reduction in testosterone after a cycle.
If so, a SARMs PCT might be useful.


Ostarine is a supplement that can be used to increase muscle mass and improve muscle appearance. It's particularly effective when used as part of SARMs stacks for bodybuilding. Evidence suggests that this might be a safer alternative to traditional steroids - even for cutting and bulking. Still, it's important to speak to a medical professional and consume the substance as responsibly as possible.

Ostarine is still not approved by the FDA for human use, and it is banned by WADA and other sports regulators. Avoid this substance if you are an athlete that is required to take drug tests.

Also, ensure to source from a recommended supplier—using the black market might result in a sub-standard product.

Ostarine (MK-2866)
Ostarine (MK-2866) Review: Benefits, Dosage, & Side Effects 1

Discover the power of Ostarine MK 2866 to take your athletic performance and recovery to the next level. Learn about its benefits, dosage and side effects.

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