MK-2866 (Ostarine) Results: I Tried It For 8 Weeks. Here’s What Happened.


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Last year I used a SARM called MK-2866 (Ostarine) for 8 weeks.

For the past couple of years, I’ve been researching and testing multiple different SARMs (selective androgen receptor modulators) as a way to build muscle and get in shape with less risk of side effects.

They say MK-2866 can be used for bulking and cutting because it’s good for gaining muscle and preserving muscle when cutting.

But is MK-2866 safe, and does it really work?

Carry on reading to find out what happened when I used it for 8 weeks!

What is MK-2866?

MK-2866 is a research chemical known as Ostarine.

It’s a non-steroidal SARM (selective androgen receptor modulator) that has the potential to increase lean body mass without causing the side effects associated with traditional anabolic steroids.

The US FDA classifies Ostarine as an “investigational drug”, meaning that it is not approved for human use.

However, it is available to researchers and is popular among recreational and professional bodybuilders.

Due to its potential to increase athletic performance, Ostarine is banned by all major sporting bodies, including the World Anti-Doping Agency (WADA).

So, what does Ostarine do?

MK-2866 Benefits?

Much of what we know about MK-2866 comes from animal studies. However, some past studies have explored MK-2866 in humans:

  • In 2011, a double-blind, placebo-controlled Phase II trial explored the effect of Ostarine on a group of 120 older men over 60. After 12 weeks, researchers found that men who had taken 3 mg of Ostarine per day gained more lean body mass than those who received a placebo. This led researchers to speculate that Ostarine may help treat muscle wasting caused by cancer and other diseases.
  • In 2013, a double-blind, randomized controlled Phase II trial examined the effect of Ostarine on a group of male and female patients with cancer. After 15 weeks, researchers found that patients who received 3mg of Ostarine daily gained an average of 1.5kg lean body mass.

MK-2866 helped cancer patients gain lean body mass on just 3mg of Ostarine per day, so you can see how it could benefit someone cutting weight who wants to preserve muscle mass.

Or even someone on a bulk who wants to gain muscle.

Unfortunately, there is no published research into Ostarine’s use in healthy test subjects, and there’s no good scientific evidence that MK-2866 offers any medical benefits in healthy people, hence its status as a research chemical.

So what do we know about its side effects?

Side effects of MK-2866

The most common side effects of MK-2866 seem to be:

  • Dry skin
  • Diarrhea
  • Muscle aches
  • Erectile dysfunction

There have not been enough studies to show the side effects of long-term use of Ostarine.

According to this editorial by Charles Paul Lambert published in the Journal of Cachexia, Sarcopenia, and Muscle, Ostarine has a “safer side effect profile than testosterone” and can “safely and effectively increase muscle mass” in Phase II clinical trials.

There’s no formal research into what effect Ostarine has on healthy people, but there are concerns that it suppresses natural testosterone levels and may cause liver damage and heart attacks.

So, although it looks safer than using anabolic steroids, there are some potential risks.

MK-2866 Results: Here’s What Happened When I Used Ostarine For 8 Weeks

I’ve been lifting weights for over five years and currently following a 5-day split.

For my MK-2866 cycle, I followed a bulking routine and bulking diet, focusing on gaining as much strength and mass as possible.

Most articles I read online said that MK-2866 is most effective at 20mg per day.

So that’s what I started taking, and here’s what happened:

Great Pumps

The first thing I noticed after using Ostarine for a few days was that I started getting some crazy pumps in the gym.

After just a 30-minute chest workout, my pecs were ready to burst out of my shirt.

Crazy Workouts

I also noticed my workouts reached a new level of intensity when I was using MK-2866.

I worked out longer without getting tired, lifting heavier, and doing more reps.

I felt like a 30-minute workout on MK-2866 was more productive than when I’d do 60-minute workouts before using it.

I was hitting all personal bests on the deadlift, squat, and bench press. It felt amazing.

Muscle Gains

After using it for almost 8 weeks, I gained just over 6lbs (3kg), which isn’t a huge amount, but I also had much less fat on me, so I was looking way more muscular and ripped.

So at a minimum, it helped me gain 6lbs of muscle in 8 weeks which is pretty impressive.

Side Effects

After using it for about 8 weeks, I began to experience some side effects that caused me to stop using it.

First, I began to notice my sex drive was very low, and getting an erection was almost impossible.

Then came the muscle aches. I felt aches and pains all over, making it hard to work out, and I just didn’t feel right.

So I stopped using MK-2866 and was back to normal within a few days.

Should You Try MK-2866?

Everything started great with Ostarine.

I loved the pumps it gave me and the intense workouts and muscle gains.

And I think it would be great for people on their cut who want to burn fat and preserve muscle.

But the side effects are no joke, and after looking into it more, it looks like side effects are very common with MK-2866, and most people experience them.

Ostarine works, but its side effects are no joke, so I recommend giving it a miss.

But don’t worry, there’s a better alternative.

What’s Better Than MK-2866?

Over the past couple of years of testing out SARMs and experiencing quite a few side effects, I found this company called Crazy Bulk that sells an MK-2866 alternative called Osta-2866.

Their website says that Osta-2866 provides the same awesome benefits as Ostarine but without the nasty side effects.

I was intrigued and decided to give it a go, so I ordered some, and it arrived within a couple of days.


I’ve been using it for more than 3 months, and their claims are true.

I’ve experienced no side effects and all the positive benefits of using MK-2866.

Since using Osta-2866 by Crazy Bulk:

  • I’ve gained 8lbs of muscle
  • Have tons of energy
  • Get amazing pumps
  • Have burned off some fat and am looking way more ripped

It feels like I’m using the real stuff, yet I haven’t noticed any negative side effects, so I think they’ve made a great product.

If you’re thinking of using MK-2866, I would recommend giving Osta-2866 a try first. It’s powerful stuff and much safer.

Click here to visit the official Osta-2866 website and learn more about what it will do for you!

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