
What is Ostarine (MK2866)?
Ostarine, also known as Ostabolic, is a selective androgen receptor modulator (SARM) developed by GTX Pharmaceuticals. It was originally developed to prevent muscle loss in people suffering from muscle wasting conditions such as HIV and cancer.
Importantly, this study provides evidence that GTx-024 (Ostarine) provides beneficial anabolic effects on total lean body mass and physical function without the adverse consequences often seen with testosterone and other anabolic steroids.
Ostarine is a very versatile SARM. You can run it by itself as a mild anabolic, you can use it as a supplement to help injuries recover, and you can use it in a post cycle therapy (PCT) to prevent muscle loss.

SARMS Vs Steroids
I like to use the analogy of SARMS as steroid’s little brother. The anabolic properties of SARMS are not as strong as steroids but SARMS do not cause any of the side effects commonly associated with steroid usage. SARMS are selective in their actions. They have a special affinity for muscle, but not for other tissues like the prostate, liver, and brain. They also don’t convert into unwanted molecules like DHT, prolactin or estrogen. This makes common side effects associated with steroids like gynecomastia, water retention, hair loss etc. impossible.
Side Effects, Dosages and Half Life
The only side effect users will notice when using ostarine is mild Hypothalamic-Pituitary-Testicular Axis (HPTA) suppression. With a low dosage, the rate of suppression will be extremely minimal. A mini PCT with a well formulated natural testosterone booster such as N2Generate ES will return testosterone levels back to normal once the cycle is finished. Ostarine is not liver toxic and does not affect cholesterol levels, blood pressure, your kidneys or your prostate.
The standard recommended dosage of ostarine is 25 milligrams (mg) per day for 8- 12 weeks. The half-life of ostarine is 24 hours so a once per day dose is all that is needed. The time of day you take the Ostarine does not matter. Furthermore, it does not matter if you take ostarine on an empty stomach or with food.
How To Use Ostarine PROPERLY!
As A Mild Anabolic

Ostarine (MK2866) will provide subtle yet keep able gains in muscle size and muscle strength. Most users will gain 5-10 pounds of muscle over an 8-12 week Ostabolic cycle. MK 2866 causes no water retention or bloat so the gains stay with you once the cycle is over. Some of the benefits of MK-2866 include:
- Increased muscle mass
- Improved strength
- Better endurance
- Joint and ligament healing abilities
- Enhanced sense of overall well being
Ostarine is becoming extremely popular amongst athletes to maximize the results they get from their training. For example, the UFC fighter Amanda Ribas received a two-year suspension after testing positive for ostarine.
Week | Ostarine (MK2866) | N2Generate ES |
1 | 25mg/day | |
2 | 25mg/day | |
3 | 25mg/day | |
4 | 25mg/day | |
5 | 25mg/day | |
6 | 25mg/day | |
7 | 25mg/day | |
8 | 25mg/day | |
9 | 5 tablets/day | |
10 | 5 tablets/day | |
11 | 5 tablets/day | |
12 | 5 tablets/day |
To Help Injuries Recover
Ostarine has proven to be quite beneficial in healing and preventing injuries in tendons, bone, and ligaments. MK-2866 is a favorite of many cross fit athletes and bodybuilders who often sustain injuries during training.
Most users who are suffering from a major injury will stack Ostabolic with TB500 and human growth hormone (HGH).
Week | Ostarine (MK2866) | TB500 | Human Growth Hormone | N2Generate ES |
1 | 25mg/day | 500mg/day | 3IU/day | |
2 | 25mg/day | 500mg/day | 3IU/day | |
3 | 25mg/day | 500mg/day | 3IU/day | |
4 | 25mg/day | 500mg/day | 3IU/day | |
5 | 25mg/day | 500mg/day | 3IU/day | |
6 | 25mg/day | 500mg/day | 3IU/day | |
7 | 25mg/day | 500mg/day | 3IU/day | |
8 | 25mg/day | 500mg/day | 3IU/day | |
9 | 5 capsules/day | |||
10 | 5 capsules/day | |||
11 | 5 capsules/day | |||
12 | 5 capsules/day |
In post cycle therapy’s (PCTs)
Ostarine is a fantastic addition to any post cycle therapy. As a SARM, MK2866 selectively binds to receptors in muscle tissues and continues activating androgen receptors while the selective estrogen receptor modulators (SERMs) nolvadex and clomid bring natural testosterone production back to normal. The continued muscle activation throughout the PCT allows for no loss of muscle mass or strength during the PCT. In fact, most users who run MK 2866 in their PCT actually report an increase in strength!
However, you only want to use a small dosage of Ostarine in your PCT because bloodwork shows that higher doses of ostabolic (over 25mg/day) can cause HPTA suppression.
Week | Aromasin | N2Generate ES | N2guard | Ostarine (MK2866) | Cardarine (GW501516) | Clomid | Nolvadex |
1 | 12.5mg/ every other day | 5 tablets/day | 7 capsules/day | 25mg/day | 20mg/day | ||
2 | 12.5mg/ every other day | 5 tablets/day | 7 capsules/day | 25mg/day | 20mg/day | ||
3 | 5 tablets/day | 7 capsules/day | 25mg/day | 20mg/day | 50mg/ day | 20mg/day | |
4 | 5 tablets/day | 7 capsules/day | 25mg/day | 20mg/day | 50mg/ day | 20mg/day | |
5 | 7 capsules/day | 25mg/day | 20mg/day | 25mg/ day | 10mg/day | ||
6 | 7 capsules/day | 25mg/day | 20mg/day | 25mg/ day | 10mg/day | ||
7 | 7 capsules/day | 25mg/day | 20mg/day | 25mg/ day | 10mg/day | ||
8 | 7 capsules/day | 25mg/day | 20mg/day | 25mg/ day | 10mg/day |
Sources for MK 2866

The biggest problem with purchasing SARMS is trying to find a reputable source. SARMs are legally allowed to be sold as research chemical liquids. It’s a legal loophole. If the company selling the SARM puts ‘for research purposes only’ on the label, the product is no longer regulated by the FDA.
This allows companies to legally sell fake and under dosed products because there is no regulation. As long as they put ‘for research purposes only’ on the label, they can put whatever they want in the product and legally sell it.
Make sure to do lots of research on sources prior to ordering. A great resource to us is the source reviews section on the evolutionary.org forums.
Ostarine Review
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Build Lean Muscle Mass
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Boost Strength
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Increase Endurance
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Speed Up Recovery
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Enhance Overall Health