MK-2866 (Ostarine) Research Guide

Full name: Ostarine / Enobosarm (MK-2866)

One of the most widely discussed selective androgen receptor modulators (SARMs). Studied for preserving and building lean muscle with fewer androgenic side effects than anabolic steroids. It is not an approved drug and is banned by WADA.

How MK-2866 (Ostarine) Works

Selectively binds androgen receptors in muscle and bone tissue, stimulating anabolic (muscle-building) signaling while having relatively less effect on the prostate and other androgen-sensitive tissues than testosterone.

Dosing Protocol

• Typical dose: Commonly cited 10-25 mg/day (research)
• Frequency: Once daily
• Duration: Commonly cited 8-12 week cycles
• Route: Oral

Reported Benefits

• Lean muscle preservation/gain
• Bone density support (research)
• Less androgenic than steroids
• Studied for muscle wasting

Potential Side Effects

• Testosterone suppression
• Lowered HDL cholesterol
• Possible liver enzyme elevation
• Fatigue/mood changes during/after a cycle

Research Citations

1. Enobosarm in muscle wasting (2013) - Increased lean body mass and improved physical function in cancer-related muscle wasting trials.

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