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Ostarine (MK-2866)
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Ostarine (MK-2866)
Androgens & SARMs
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A widely studied oral SARM, researched for lean tissue and physical function.
Track Ostarine (MK-2866) free
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Class
SARM (research)
Route
Oral
Typical range
10 to 25 mg/day
Half-life
About 24 hours
Schedule
Once daily
Educational summary. See Sources & research below for the underlying studies.
What it is
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Ostarine (MK-2866, also called enobosarm) is one of the most studied SARMs. SARMs are investigational research compounds, not approved medicines, and are sold for laboratory research only.
• Status: investigational, not approved for human use
• Researched for lean muscle and physical function
• Taken by mouth, so there is no injection site
How it works
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A SARM aims to signal muscle and bone while sparing other tissues.
• Binds androgen receptors with some tissue selectivity
• Signals muscle and bone more than skin or prostate, in theory
• The goal is androgen-like signaling with fewer off-target effects
Dosing and mixing
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Reference tiers only. Track the dose you are already taking.
Low
About 10 mg per day
FOR The most conservative researched amount
BENEFIT Often picked as the lower-exposure receptor-signaling tier
Standard
About 15 to 20 mg per day
FOR The commonly cited research range
BENEFIT The range most often cited in research discussions
High
About 25 mg per day
FOR Upper end seen in some research
BENEFIT A higher-exposure tier with greater suppression risk
Schedule: Once daily by mouth. Research discusses periods of several weeks, then time off.
Beginner ramp: Start at the lowest researched amount and stay conservative.
Ranges are reference only, not a recommendation. See Sources & research below.
How to take it
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Taken by mouth, usually once a day. There is no injection site.
• Measure liquids carefully, concentrations vary a lot
• Keep the timing consistent day to day
• Pair any research with bloodwork and a knowledgeable clinician
What to expect
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Weeks 1 to 2
Most report little to notice early on.
Weeks 3 to 6
Strength and recovery changes are commonly discussed here.
After use
Research notes a recovery period for natural hormone production.
Side effects
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Commonly reported
• May lower natural testosterone with longer use
• Headache or fatigue reported by some
See a clinician if
• Yellowing of the skin or eyes
• Unusual or lasting fatigue
• Any reaction that worries you
Storage
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Keep it stable and clearly labeled.
• Store cool and out of direct light
• Keep away from children and pets
• Label clearly as a research compound
Sources & research
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Enobosarm has been studied in clinical trials for muscle wasting. It is not an approved medicine.
Human studies · Dobs et al., Lancet Oncology 2013 ↗
Sources are provided for education and are not exhaustive. Where a source names a specific trial or journal it is shown above; always confirm with a licensed clinician.
Educational and research information only. Not medical advice. Always confirm dosing and safety with a licensed clinician.
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