What is Ostarine?

Ostarine (also known as MK-2866) is a SARM — a selective androgen receptor modulator. It was originally developed to treat muscle wasting and bone loss in patients with conditions like osteoporosis and cancer cachexia. It became popular in fitness circles for its ability to preserve and build lean muscle with relatively mild side effects.

Quick Facts

How Does It Work?

Ostarine binds selectively to androgen receptors in muscle and bone tissue. Because it targets those receptors specifically, it triggers anabolic activity — muscle growth and bone strengthening — without heavily affecting other tissues like the prostate or skin. This selectivity is what sets SARMs apart from traditional anabolic steroids.

What It's Used For

• Preserving lean muscle mass during a calorie deficit or cut
• Building moderate amounts of lean muscle during a bulk
• Supporting muscle and bone recovery between cycles or after injury

What to Expect

Most users notice improved muscle hardness and fullness within the first two weeks. Over a full cycle, you can expect steady, keepable lean muscle gains along with improved recovery between sessions. It won't deliver dramatic size gains like a steroid would, but the results are clean and easier to maintain.

Possible Side Effects

• Mild testosterone suppression, especially at higher doses or longer cycles
• Temporary headaches or fatigue, particularly in the early weeks
• Minor vision disturbances (yellow tint or blurred vision) — rare but worth monitoring

Cycle & Dosage Notes

A typical cycle runs 8–12 weeks, with most users sticking to 10–25 mg per day. Suppression is generally mild, but a light PCT (such as Nolvadex) is still recommended after longer or higher-dose runs to help natural testosterone bounce back. Ostarine stacks well with other SARMs like Cardarine or LGD-4033 depending on your goal.

Storage

Keep at room temperature (15–25°C), away from light and moisture. Leave in the original packaging.

This info is for research and educational purposes only. Check the laws in your country before ordering.