MK 2866 (Ostarine) by Dragon Pharma
What Is MK 2866 (Ostarine)?
MK 2866, widely known as Ostarine and formally as Enobosarm, is a selective androgen receptor modulator (SARM). It was studied in clinical research for preventing muscle loss in wasting conditions, and in sports research it is the most commonly chosen SARM for calorie-restricted phases because of its reputation for preserving lean tissue.
Dragon Pharma supplies MK 2866 as a fixed 25 mg oral tablet. In bodybuilding contexts Ostarine is treated as a conditioning and retention tool rather than a mass driver: it is referenced for keeping muscle and strength steady while dieting, supporting a dry and tight look, and helping athletes stay consistent when calories and recovery are limited.
Each pack contains 100 tablets of MK 2866 (Ostarine) by Dragon Pharma. Ostarine is a research chemical, not an approved medicine, and is intended for laboratory research only.
MK 2866 Research Use
Ostarine is taken once daily in research protocols, and community references most often describe amounts in the 10-25 mg range. Research windows commonly run 6-8 weeks, with 8 weeks being the most frequently cited maximum before a break.
| Protocol reference | Amount | Note |
|---|---|---|
| Starting reference | 10 mg once daily | Lower dose for naive subjects or longer windows |
| Common reference | 25 mg once daily | Full tablet, the most cited mid protocol dose |
| Upper reference | 25 mg once daily | Higher amounts add suppression risk without clear benefit |
- Frequency: 1 tablet per day at a fixed time
- Duration: 6-8 weeks, followed by an equal break
- Monitoring: liver enzymes and lipid panel are commonly tracked
Practical Notes
Each tablet provides exactly 25 mg of Enobosarm, so a 100 tablet pack easily covers a full 8 week protocol. MK 2866 is for research use only and is not intended for human consumption.
MK 2866 Stacks
Ostarine is most often stacked for cut and recomp phases with compounds that support conditioning, muscle retention and structured recovery. All links point to same-brand Dragon Pharma products.
| Combination | Why it is combined |
|---|---|
| Winstrol 10 | Dry, cosmetic-focused conditioning phase built around retention |
| Masteron 100 | Hardness, density and strength retention during aggressive cuts |
| Helios | Advanced thermogenic block aimed at visual sharpness |
| HCG 2500IU | Structured recovery transitions after suppression-aware protocols |
MK 2866 Side Effects
Ostarine is considered one of the milder SARMs, but it is not side effect free. Suppression becomes more noticeable as the dose climbs, and liver enzyme and lipid changes are the most commonly reported lab findings.
- Testosterone suppression, significant at higher daily amounts
- HDL cholesterol drop and occasional liver enzyme elevations
- Headache, sleep disturbance or nausea in the first days
- Reports of acne and mood changes in some subjects
MK 2866 (Ostarine) is a research chemical. It is not approved for human or veterinary use. Keep it away from food, drink and skin contact, and store it out of reach of children.
For research use only. Nothing on this page is medical advice; a suppression-aware protocol requires planning, monitoring and trained personnel.
What is Ostarine (MK 2866)?
Ostarine is the common name for MK 2866, also called Enobosarm, a selective androgen receptor modulator. It was developed for research into muscle wasting and is the most frequently used SARM in cutting research.
Is Ostarine a steroid?
No. Ostarine is a SARM, not an anabolic steroid. It binds selectively to androgen receptors in muscle and bone tissue, which is why its effects and risk profile differ from traditional anabolics.
What is Ostarine used for in research?
Ostarine is studied for preserving lean muscle during calorie restriction, maintaining strength, and supporting a dry, conditioned look in recomp protocols. It is not used as a primary mass builder.
How much Ostarine should I take per day?
Most cited research references fall in the 10-25 mg per day range, with 25 mg as the most common full protocol dose. Beginners and female subjects typically start at the lower end.
How long does an Ostarine cycle last?
The most frequently referenced window is 8 weeks, with shorter 6 week protocols for lower doses. A break of equal or greater length is recommended before another cycle.
Does Ostarine suppress natural testosterone?
Yes, suppression is real and dose dependent. Cases of testosterone dropping from the normal range to low levels on 20-30 mg daily for two months have been reported, so blood work is recommended.
Do I need PCT after Ostarine?
Opinions differ because Ostarine is mild, but after longer or higher dose cycles recovery support is commonly advised. A blood test showing low testosterone is the best guide for whether PCT is needed.
What are the side effects of Ostarine?
Reported effects include testosterone suppression, a drop in HDL cholesterol, possible liver enzyme increases, headache, sleep problems, nausea and in some users acne. Severity scales with dose and duration.
Can women use Ostarine in research?
Ostarine is popular in research with female subjects because virilization risk is considered lower than with steroids at modest doses. Doses are kept low, typically around 10 mg per day or below.
Is Ostarine legal and safe?
Ostarine is not approved for human use and is banned in sport. As a research chemical it is legal to buy in many regions, but it is unregulated, so purity and dosing rely entirely on the source and the researcher.
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