- ≥98% by HPLC with identity confirmation
- Lot-matched certificate of analysis
- Ships next business day, tracked
MK-2866 (Ostarine)
Enobosarm — non-steroidal selective androgen receptor modulator, capsules or liquid
- FormOral capsules in a sealed bottle, or solution in a 30 mL dropper bottle
- Mol. weight389.33 g/mol
- Research areasAndrogen receptor pharmacology, tissue-selective anabolic signalling, muscle-wasting and bone-density models, doping-control analysis
Overview
SARMs were designed around a pharmacological question: whether a ligand can engage the androgen receptor with tissue-selective downstream consequences — measurable anabolic activity in muscle and bone with a different profile in prostate and other reproductive tissue than that of testosterone or synthetic anabolic steroids. That selectivity is generally attributed to ligand-specific receptor conformations, differential coregulator recruitment and the absence of 5-alpha-reductase and aromatase conversion, since ostarine is not a steroid.
Ostarine has the longest development history of the compounds in this class, catalogued as enobosarm, GTx-024 and S-22, and it is an aryl-propionamide, a chemotype that came out of early non-steroidal antiandrogen work rather than from modifying a steroid scaffold. At 389.33 g/mol with formula C19H14F3N3O3 it carries no steroid ring system, and it is a substrate for neither aromatase nor 5-alpha-reductase, so the metabolite chemistry that complicates interpretation of testosterone studies does not arise. Two formats are stocked from material tested to at least 98% by HPLC: sixty 10 mg capsules for fixed unit content, and 30 mL at 20 mg/mL for dilution series. A large separate literature covers doping-control detection of the parent compound and its metabolites.
Specifications
Identity
- CAS number
- 841205-47-8
- Molecular formula
- C19H14F3N3O3
- Molecular weight
- 389.33 g/mol
Supply & purity
- Form
- Oral capsules in a sealed bottle, or solution in a 30 mL dropper bottle
- Purity
- ≥98% by HPLC with identity confirmation; lot-matched COA available
- Solubility
- Poorly water soluble; soluble in ethanol, DMSO and polyethylene glycol vehicles
Additional detail
- Available options
- 10 mg × 60 capsules; 30 mL liquid at 20 mg/mL
- Also known as
- Ostarine, enobosarm, GTx-024, S-22
- Compound class
- Non-steroidal selective androgen receptor modulator (aryl-propionamide)
- Molecular target
- Androgen receptor (NR3C4), partial agonist activity in the reported literature
- Metabolic note
- Not a substrate for aromatase or 5-alpha-reductase
- Research areas
- Androgen receptor pharmacology, tissue-selective anabolic signalling, muscle-wasting and bone-density models, doping-control analysis
- Storage
- Cool, dry conditions away from direct light; refrigeration extends shelf stability
Units and conversions
Capsule and troche strengths are stated per unit, so the figure a method needs is usually a conversion rather than a dilution. The mcg to mg converter handles the milligram-to-microgram step, and the millilitre arithmetic if you are working from a solution format instead.
Certificate of analysis
Every lot of MK-2866 (Ostarine) is released against a certificate of analysis: the batch-specific laboratory data for that lot, not a generic document for the compound. The lot number on the certificate matches the lot number printed on the label you receive — the vial label itself, where the product is vialled — so the record and the material it describes can always be reconciled.
Purity: ≥98% by HPLC with identity confirmation — the specification for this listing. The figure for the lot you receive is the one reported on that lot’s certificate.
No lot certificate is on display on this page at the moment. That is a publishing state and not a testing one: lots are released and documented as described above whether or not the document is posted here, and we will send what exists for the lot in stock, or for a lot already on your bench, by its number.
Certificates are available on request before you order as well as after, with no account and no charge. Request the certificate for this listing, read the testing and documentation policy in full, or see how to read a peptide COA.
Questions about MK-2866 (Ostarine)
Is MK-2866 a peptide?
No. Ostarine is a small non-steroidal organic molecule of the aryl-propionamide class, formula C19H14F3N3O3 and mass 389.33 g/mol. It is catalogued alongside research peptides because the same laboratories study it, not because of any structural relationship.
What formats are available?
Two: a bottle of 60 capsules at 10 mg each, and a 30 mL solution at 20 mg/mL for volumetric work. The capsule format gives fixed unit content; the solution suits dilution series and vehicle-controlled in-vitro or animal-model designs.
Is it third-party tested?
Yes. Each lot is analysed by an independent laboratory using HPLC with identity confirmation, and a lot-matched Certificate of Analysis is available for the batch supplied. Match the lot number on the container to the COA before recording any data.
How is it stored?
Keep both formats cool, dry and out of direct light, with the container sealed. Refrigeration extends shelf stability and is the usual choice for the solution. Allow a chilled container to warm before opening so that condensation does not affect the contents.
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