MK-2866 (Ostarine, Enobosarm) is available for research supply in three primary formats: liquid solution, encapsulated powder, and raw powder. Each format has distinct practical advantages depending on the research application, the concentrations required, and the available laboratory infrastructure. This guide examines the key differences to help researchers identify the most appropriate format for their work.

Raw powder

Raw MK-2866 powder is the most flexible format for research purposes. Supplied as a white to off-white crystalline powder, it allows the researcher to prepare working stock solutions at any required concentration using their preferred solvent system.

Key properties

• Concentration: 1,000 mg (1g) per vial — pure compound, no solvent dilution
• Solubility: Soluble in DMSO (≥25 mg/mL), absolute ethanol, and PEG-400. Poorly soluble in water
• Flexibility: Full control over concentration, solvent, and formulation
• Shelf life: 24 months at room temperature; long-term at −20°C

Best suited for

Powder is the format of choice for researchers who need to prepare custom concentrations, work with non-standard solvents, or incorporate MK-2866 into complex formulations. It is also the most economical format on a per-milligram basis for large-volume research applications.

Reconstitution from powder requires a calibrated analytical balance and appropriate laboratory technique. For in-vitro work, dissolution in DMSO at a high stock concentration (e.g., 10–25 mg/mL) followed by serial dilution into cell culture media is standard practice. Final DMSO concentrations in assay wells should be kept below 0.1% to avoid vehicle effects on cell viability.

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Liquid solutions

Pre-dissolved liquid solutions provide a ready-to-use MK-2866 formulation that eliminates the reconstitution step. Buy Ostarine Australia supplies liquid solutions in PEG-400 at three concentrations: 20mg/mL, 25mg/mL, and 30mg/mL.

Key properties

• Solvent: Pharmaceutical-grade polyethylene glycol 400 (PEG-400)
• Available concentrations: 20mg/mL, 25mg/mL, 30mg/mL
• Available volumes: 30mL, 60mL, 90mL, 120mL, 150mL
• Concentration accuracy: Within ±5% of stated value
• Shelf life: 24 months at room temperature; do not freeze

Choosing a concentration

The three concentration options serve different research needs. The 20mg/mL formulation is appropriate where precise low-volume dispensing is required and a lower concentration simplifies dilution calculations. The 25mg/mL formulation offers a mid-range balance between volume efficiency and dispensing precision. The 30mg/mL formulation provides the highest compound density per volume, reducing the total solvent volume required for a given dose — relevant for applications with solvent volume constraints.

For a detailed comparison of the three concentrations and guidance on selecting the appropriate formulation for specific applications, see our Ostarine Concentration Guide.

Best suited for

Liquid solutions are the most convenient format for researchers running frequent experiments with standardised doses. Pre-dissolved stock eliminates weighing error, reduces preparation time, and ensures batch-to-batch consistency across experimental runs. PEG-400 is a widely used pharmaceutical excipient with a well-characterised safety profile in cell and animal research contexts.

Capsules

Encapsulated MK-2866 provides discrete, pre-measured units of compound at a specified nominal dose. Buy Ostarine Australia supplies capsules in sizes ranging from 5mg to 5g total compound per capsule.

Key properties

• Available sizes: 5mg, 10mg, 25mg, 50mg, 100mg, 200mg, 500mg, 1g, 2g, 5g
• Fill accuracy: Within ±5% of stated value
• Manufacture: Controlled environment with fill weight verification
• Shelf life: 24 months at room temperature in a sealed, dry container

Best suited for

Capsules are appropriate for in-vivo rodent studies where oral gavage or dietary administration of a known quantity is required, and for cell culture applications where precise unit counts of compound are preferable to volumetric dispensing. The discrete unit format eliminates measurement steps for researchers who have validated the fill weight for their batch.

For applications requiring content dissolution, capsules can be opened and the fill powder reconstituted in appropriate solvents. Capsule shell material is standard pharmaceutical-grade hydroxypropyl methylcellulose (HPMC) or gelatin, depending on batch, and is soluble in aqueous systems.

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Format comparison summary

Property	Powder	Liquid	Capsules
Preparation required	Yes (reconstitution)	No (ready to use)	Minimal
Concentration flexibility	Full	Fixed (3 options)	Fixed (10 sizes)
Solvent control	Full	PEG-400 only	N/A (solid dose)
Best for in-vitro	Yes	Yes	With dissolution step
Best for in-vivo (oral)	With formulation	Yes (PEG-400 vehicle)	Yes
Dosing precision	Balance-dependent	Pipette-dependent	Pre-measured

For a complete overview of MK-2866 as a research compound — including mechanism of action, chemical properties, and clinical research history — see our MK-2866 Ostarine Research Guide. For questions about purity and COA documentation across all formats, see our Lab Testing page.