Ostarine MK-2866 Side Effects, Uses and Information I Blogs

Ostarine MK-2866 Side Effects, Uses and Information

/ 10:42 AM May 10, 2022

Ostarine MK-2866 is a well-known selective androgen receptor (SARM) used by bodybuilders and some athletes to boost their performances. It’s also being studied as a potential treatment option for particular medical conditions, such as osteoporosis and muscle wasting. The only problem is that there are some MK-2866 side effects that you should know about.

There are currently studies being conducted on the substance. And while it’s not technically approved for legal sale for human use in any country, some people still buy it and take it on the down-low to help them get bigger muscles and better results at the gym.


It’s growing in popularity in the body-building community. And some bodybuilders swear by its effectiveness.

MK-2866 is technically the medical research name of the substance. And even though the FDA does not technically approve it, you can still purchase it online. It would help if you learned about it before you do, though.

Ostarine works by binding to the androgen receptor to stimulate AR signaling in muscle and bone tissue selectively.

This creates a similar benefit as testosterone, albeit without some of the hormonal side effects.

In this post, we will dig deep and explore precisely what Ostarine is and the highlights of what you need to know about it.

But first, you must understand that this post should not be considered medical advice!

This article should not be considered medical advice. Be advised that this article aims to deliver some helpful information about Ostarine and Ostarine MK-2866 side effects, especially those that are anecdotally reported.

Ostarine is considered dangerous by many medical authorities. It isn’t readily legal or available to buy in the United States, and it’s not approved for human use or consumption in any country.

It has also been banned by nearly every professional and amateur organized sport.

It’s prohibited at all times under the S1.


The official stance on Ostarine is that you should avoid taking it because it hasn’t been tested enough to verify that it’s safe.


Therefore, anyone who decides to take it should only do so at their own risk.

Further on in the article, we list our favorite safe and healthy Ostarine alternative (OSTA 2866 from CrazyBulk). So if you want a supplement to boost your muscle gains, that may be a safer route.

Click Here to Try a Safe Alternative – Osta 2866!

With that being said, let’s dive into the post and talk about Ostarine MK-2866.

What Is Ostarine MK-2866?

What Is Ostarine MK-2866?

Ostarine MK-2866 is a SARM that has many studies behind it. It’s also well known as a SARM that has been around for quite some time, although it’s a newcomer on the body-building scene.

But perhaps even more interesting, it’s gained a reputation for being more of a ‘mild’ substance in the SARM category.

Ongoing research supports that it doesn’t suppress your natural testosterone levels to the same drastic extent as some other SARMs do, which could be used without experiencing as many adverse side effects.

But there’s also no extensive testing.

What Does Ostarine MK-2866 Do?

Ostarine MK-2866 is reportedly used to generate increased muscle mass, improved strength, and greater overall power output during workouts.

It’s also a belief that it gives you the power to burn more fat and get rid of excess water weight.

Compared to other substances, like Testolone or Ligandrol, most people who use it find that Ostarine is relatively mild. It won’t blast your muscles quite as hard, but it doesn’t pack in as many side effects risks.

Because of this, it’s one of the most commonly used SARMs for beginners to the SARM compound category.

Is Ostarine MK-2866 Being Studied?

Viking Therapeutics is currently studying Ostarine to treat cancer-related muscle-wasting.

During one study, which experts performed on the effect that Ostarine could have on lean muscle mass, they found that individuals can use it to increase muscle mass drastically after just 16 weeks.

During the trial, health experts gave the participants a 1mg dose of the compound. And over 16 weeks, those participants gained about 2 to 3 pounds of new lean muscle mass.

Plus, even when the participants increased their daily dosages to 3mg, they still didn’t show any adverse side effects.

But this leads to a good question… what is the ideal dosage for Ostarine MK-2688?

We’re going to discuss it in greater depth in just a moment.

But first, let’s get into what are the uses of MK-2866.

What Is Ostarine MK-2866 Used For?

What Is Ostarine MK-2866 Used For?

You can use Ostarine MK-2866 to improve lean body mass significantly. This makes it a possible treatment option for people suffering from diseases like wasting syndrome, cachexia, and other autoimmune disorders.

It also shows promise as a treatment for age-related muscle loss problems and could potentially be used for muscle loss disorders, such as muscular dystrophy.

It’s also possible that, in the future, people may use it to treat breast cancer symptoms, aid in healing urinary incontinence, and help to overcome a loss of bladder control.

What Is The Average Ostarine MK-2866 Dosage?

What Is The Average Ostarine MK-2866 Dosage?

Most people who take Ostarine are in the bodybuilder/fitness scene.

Since this is a milder SARM, it is also popular among women.

Men who take Ostarine at the gym for bodybuilding purposes generally take anywhere from 20 to 30 milligrams per day.

(This is purely anecdotal and based on our research online.)

Dosages are going to be different for women.

Most people who have experience with Ostarine MK-2866 say that women should probably stick to 5 to 10 milligrams of it per day.

Now, those are some pretty intense dosages comparable to how much people were taking in clinical studies.

People in clinical studies have typically seen pretty advanced lean muscle mass growth after taking just 1 to 3 mg per day.

There’s a lot of evidence to point out that these lower dosages will be better for everyone overall, and here’s why.

When you take smaller doses, you dramatically decrease the risk of experiencing any adverse side effects.

Plus, there’s a bit of evidence to point toward the fact that you may tend to experience some diminishing returns when taking super high dosages.

Therefore, there’s just a lot of evidence pointing toward the fact that starting at 1 to 3 mg will be a better fit for most people.

But of course, always keep in mind that Ostarine has not been studied in-depth for an extended time. Thus, there could be possible dangers even with those smaller dosages that studies haven’t discovered yet.

What Is a Typical Ostarine MK-2866 Cycle?

What Is a Typical Ostarine MK-2866 Cycle?

A typical Ostarine cycle will last from 4 to 8 weeks or eight weeks to 12 weeks.

In the study quoted above, where participants took 1 to 3 mg of Ostarine per day, their cycles expanded to 16 weeks.

It has to do with your overarching fitness goals and what you’re trying to achieve with them.

Next, it’s essential to understand that Ostarine has a 24-hour half-life. This means that you only need to take it once per day.

Plus, it’s highly advisable that, even if you do get on a cycle of Ostarine, you only keep that cycle up for, at most, a couple of months.

Once again, it’s hard to say what adverse side effects you could run into if you keep it up for longer than that.

Click Here to Try a Safe Alternative – Osta 2866!

What Are Ostarine MK-2866 Benefits?

People who have had positive experiences with MK-2866 say that it’s a pretty user-friendly beginner SARM and that it boasts maximum benefits with few side effects.

Note: It’s essential to be aware that anecdotal evidence supports the many benefits of Ostarine (in other words, in YouTube videos, on forums, etc.).

Here are some of the benefits:

  • Contains anabolic properties
  • It helps to treat and prevent bone, muscle, and joint issues
  • Increases lean muscle mass
  • Boosts fat loss
  • Improves insulin resistance

One exciting thing about Osterine is that when it binds to an androgen receptor, it causes muscle growth, similar to testosterone.

However, since it doesn’t attach to the estrogen receptor, it doesn’t cause the usual side effects you’d typically see associated with estrogens.

In other words, you won’t tend to see the water retention, fat gain, or gynecomastia that could be present with some of the other SARMs.

This makes it especially useful for bodybuilders and athletes who want to use a milder SARM to help increase muscle mass without the increased risk associated with traditional anabolic steroids.

And really, this is partly why Ostarine is gaining so much popularity. People tend to see it as an overall safer option than some more dangerous SARMs.

What Are The Possible Ostarine MK-2866 Side Effects?

What Are The Possible Ostarine MK-2866 Side Effects?

When it comes to side effects risks while using Ostarine MK-2866, consider that these are just possible side effects. Different people’s bodies react to it differently.

Some people experience just one or a few of them, while others experience all of them.

In fact, in the study with reference above, there were no reports of side effects when users only used 1 to 3 mg dosages per day for 16-week cycles, although they still gained 1 to 3 pounds of lean muscle mass.

Anyway, let’s dive in and talk about the specific side effects that this SARM can produce.

  • Acne
  • Headaches
  • Nausea
  • Hair loss
  • Possible gyno
  • Back pain
  • High blood pressure
  • Testosterone suppression

Women can also experience unique Ostarine MK-2866 side effects, especially:

● Changes in their menstrual cycle

There has been some discussion about whether or not Ostarine MK-2866 can negatively affect the liver.

Well, some different arguments are going on about this.

On the one hand, some people in the workout community claim that Ostarine is non-methylated and, thus, that it doesn’t pose a risk to the liver.

But on the flip side of the coin, there are also websites like WebMD, which say:

“When taken by mouth: Ostarine is possibly unsafe. It might cause liver damage and other serious side effects such as heart attack.”

Thus, we couldn’t rule out the potential risk of liver toxicity as a possible side effect risk of Ostarine.

Any product that could harm your liver could produce the following side effects:

  • Jaundice (yellowing of the eyes or skin)
  • Itchiness
  • Dark urine
  • Unexplainable flu-like symptoms
  • Pain in the upper-right side of the abdomen

The FDA has also issued a public warning about the SARM, basically stating that supplements containing SARMS, in general, could be dangerous. As such, athletes shouldn’t take them.

Can You Stack Ostarine MK-2866 With Other SARMs?

Can You Stack Ostarine MK-2866 With Other SARMs?

You may be able to stack Ostarine with some other SARMs, but doing so could prove to be dangerous.

Ostarine is still a relatively new SARM. And while it seems promising, there isn’t much data available about how it may interact with other substances and compounds.

It’s possible that stacking Ostarine with other products could create interactions that will significantly boost the risk for harsh side effects.

But for people who likes stacking it, you may be interested in hearing about some of the more common stacks that we’ve heard of among people who use it.

Keep in mind that this is all anecdotal information primarily from articles, videos, and forums online.

Some people stack it with GW-501516, MK-677, or S4-Andarine.

Of course, as always, make sure to do your research and only use it at your own risk.

Does Ostarine MK-2866 Suppress Your Testosterone Levels?

The dosage and the cycle length are the two factors that will have the most significant bearing on this question.

If you plan to take a high dose of Ostarine for four weeks or more, some people say you may want to supplement with something like a PCT (post cycle therapy).

But for the most part, if you keep the dosages low, there isn’t much testosterone level suppression.

And that’s part of the reason why Ostarine is so popular among some bodybuilders.

What Can You Buy Instead Of MK-2866?

Suppose you’re thinking about taking something that’ll give you similar positive effects as Ostarine but doesn’t wish to expose yourself to the risk of potential Ostarine MK-2855 side effects. In that case, you could choose a healthier alternative that’s legal and available to buy as a supplement.

These supplement alternatives don’t necessarily contain Ostarine, but some can produce similar results, albeit with less intensity and little to zero side effect risk.

Our favorite product for this is OSTA 2866, which is a legal and natural Ostarine MK-2855 alternative for monster muscle growth.

What Can You Buy Instead Of MK-2866?

Click Here to Try Osta 2866!

CrazyBulk developed this and can help you boost muscle growth, preserve muscle mass, lift natural testosterone levels, increase muscle size, and even push past your workout limitations.

You can safely take this formula on a regular daily basis. You take four capsules with a glass of water 30 to 45 minutes before lifting, and then you stay on the supplement for 2 to 3 months to experience optimal bulking results.

And the best thing about it is that it doesn’t even pack in any dangerous or illegal additives. It’s safe and includes natural ingredients like:

  • Magnesium
  •  Zinc
  • Salacia
  • Southern Ginseng
  • Cinnamon
  • Fennel
  • Reishi Mushroom Extract

It gets rave reviews from users and mimics the MK-2866 muscle-growth effects without requiring you to order anything illegal or put yourself at risk for side effect dangers.


Hopefully, this post has helped you better understand what Ostarine is, how it works, and what kind of place it holds in the bodybuilding community.

It sounds like it has a lot of potential for upside with minimal downsides. Thus, it has possibilities of legalization in the future.

At this point, we still recommend that you go with a safe and natural alternative, like the CrazyBulk OSTA 2866 formula.

It gives you a ton of upside without exposing you to any dangerous Ostarine MK-2866 side effects, making it much safer to use as you strive to improve your gains and increase muscle mass at the gym.

FDA Disclaimer

These statements have not been evaluated by the Food and Drug Administration, and the usefulness of these products has not been investigated or confirmed through FDA-approved research. These products are not intended to diagnose, treat, cure, or prevent any diseases or medical conditions. The information presented in this article should not be considered a substitute for information provided by official licensed healthcare professionals. Please consult your doctor/healthcare provider to inquire about potential interactions and/or complications before using any products like this. The Federal Food, Drug, and Cosmetic Acts requires us to post and provide this notice.

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