Ostarine (MK-2866) Powder — 2 Grams
Ostarine, also designated MK-2866, GTx-024, or enobosarm, is among the most extensively studied selective androgen receptor modulators (SARMs) in the published literature. This listing is a research-grade reference compound supplied in powder form for in vitro and laboratory investigation. Every batch is third-party verified for identity and purity and accompanied by a downloadable Certificate of Analysis.
- Min. 98% purity (HPLC)
- Third-party verified
- 2,000 mg net
- Transparent COAs
- UV-resistant foil pouch
Specifications & Documentation
- Compound
- Ostarine (MK-2866 / GTx-024 / enobosarm)
- CAS Number
- 841205-47-8
- Molecular Formula
- C₁₉H₁₄F₃N₃O₃
- Molar Mass
- 389.33 g/mol
- Elimination Half-Life
- ~24 hours (literature)
- Compound Class
- Selective Androgen Receptor Modulator (SARM)
- WADA Classification
- Prohibited — Class S1.2 (Other Anabolic Agents)
- Form
- Crystalline powder
- Net Quantity
- 2 g (2,000 mg) per pouch
- Certified Purity
- Minimum 98% by HPLC
Third-Party Verification
Identity and purity are independently confirmed by MZ Biolabs (Tucson, AZ), a US DEA Schedule III licensed analytical facility (License RP0584676). Each production batch undergoes HPLC purity analysis and mass-spectrometry identity confirmation under Good Laboratory Practice (GLP) standards to support research reproducibility.
- Latest COA Date
- 07/08/2025
- Reported Purity
- 98.04%
- Methods
- HPLC–UV purity; MS identity confirmation
- Verifying Lab
- MZ Biolabs, Tucson, AZ (DEA Schedule III, RP0584676)
Storage & Handling
Store in a cool, dry place away from direct sunlight to maximize shelf life. Supplied in a UV-resistant foil pouch to minimize photodegradation.
- Packaging
- UV-resistant sealed foil pouch
- Storage
- Cool, dry, dark; away from direct sunlight
- Handling
- Standard laboratory PPE; measuring tools not included
- Intended Use
- Laboratory and in vitro research only
Quality & Analytical Transparency
Independent analysis has repeatedly found that materials sold online as SARMs are frequently mislabeled or adulterated. A 2017 JAMA investigation that chemically analyzed products marketed as SARMs found that only a minority accurately matched their labeled contents, and a substantial share contained unapproved or entirely different substances.[5] Batch-level third-party testing is the control that distinguishes a documented reference compound from an unverified one.
Research Context
Ostarine emerged in the late 1990s and early 2000s.[2] As a selective androgen receptor modulator, it binds the androgen receptor with tissue-selective activity.[1][5]
This material is supplied strictly as a reference compound to support such laboratory investigation. It is not a therapeutic product, dietary supplement, or sports supplement, and no clinical or performance outcomes are claimed or implied for any individual.
Compliance & Legal Status
Ostarine (MK-2866) is an investigational compound that has not been approved by the U.S. Food and Drug Administration for human use. It is not a dietary supplement, and marketing it for human ingestion is unlawful. It is supplied exclusively for laboratory research purposes.
Scientific References
- Dalton JT, Barnette KG, Bohl CE, et al. The selective androgen receptor modulator GTx-024 (enobosarm) improves lean body mass and physical function in healthy elderly men and postmenopausal women: results of a double-blind, placebo-controlled phase II trial. J Cachexia Sarcopenia Muscle. 2011;2(3):153–161.
- Komrakova M, Furtwängler J, Hoffmann DB, et al. The Selective Androgen Receptor Modulator Ostarine Improves Bone Healing in Ovariectomized Rats. Calcif Tissue Int. 2020;106(2):147–157.
- Hoffmann DB, Komrakova M, Pflug S, et al. Evaluation of ostarine as a selective androgen receptor modulator in a rat model of postmenopausal osteoporosis. J Bone Miner Metab. 2019;37(2):243–255.
- Yuan Y, Lee JS, Yost SE, et al. A Phase II Clinical Trial of Pembrolizumab and Enobosarm in Patients with Androgen Receptor-Positive Metastatic Triple-Negative Breast Cancer. Oncologist. 2021;26(2):99–e217.
- Van Wagoner RM, Eichner A, Bhasin S, Deuster PA, Eichner D. Chemical Composition and Labeling of Substances Marketed as Selective Androgen Receptor Modulators and Sold via the Internet. JAMA. 2017;318(20):2004–2010.
- ClinicalTrials.gov. Enobosarm (GTx-024) study record NCT02368691.
Research Disclaimer
For laboratory research use only. This preparation is not approved by the FDA for human use. Ostarine / MK-2866 is not a dietary or sports supplement and is not intended for human or animal consumption.
All products on this website are intended exclusively for research and development purposes. The statements herein have not been evaluated by the U.S. Food and Drug Administration. Neither the statements nor the products are intended to diagnose, treat, cure, or prevent any disease. Sports Technology Labs are chemical suppliers, not medical practitioners; our expertise is sourcing and quality control.
