Ostarine

Overview

Ostarine (MK-2866, enobosarm) is the original SARM — developed by GTx in the early 2000s for muscle wasting in cancer cachexia and later trialed for stress urinary incontinence and breast cancer. It's the mildest of the commonly used SARMs and has the largest human trial dataset, including Phase III studies. Oral, half-life around 24 hours, once-daily dosing. At trial doses (1-3mg/day) it produced measurable lean mass gains with minimal suppression and an acceptable safety profile. At community doses (15-25mg/day) it still earns its 'beginner SARM' reputation — suppressive but recoverable, noticeable but not dramatic. It's the SARM most often used by women, people doing a body recomposition, and anyone wanting to preserve muscle during a cut. It remains a research chemical, is banned by WADA, and is frequently implicated in supplement contamination cases.

Dosing Information

Common Side Effects

• · Mild testosterone suppression (dose-dependent)
• · Headaches
• · Mild lipid changes (HDL reduction)
• · Fatigue toward end of cycle
• · Joint dryness (uncommon)
• · Mild nausea at higher doses
• · Hair shedding (uncommon, in those predisposed)

Monitoring Recommendations

Total T, Free T, LH, FSH, Estradiol at baseline and 2-4 weeks post-cycle. Lipid panel at baseline and end of cycle. Liver panel at baseline and end of cycle — elevations are rare at community doses but worth confirming. Full PCT bloodwork if running over 8 weeks or at higher doses.

Storage & Handling

Community Notes

Widely considered the entry-level SARM. r/steroids consensus is that 20mg/day for 8 weeks is 'the' beginner protocol — enough to see body composition changes, mild enough that a light PCT (or even a natural recovery) is usually sufficient. Women often run 5-10mg/day and report strong results without the virilization risk of anabolic steroids. Best known as a cutting/recomp tool rather than a bulking compound. Some users stack it with MK-677 for lean gains. Ostarine-positive doping tests have been traced back to contaminated pre-workouts and 'natural' supplements more than once — worth knowing if you're tested.

Ostarine is not currently part of any catalog regimen.