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Ostarine MK-2866

The most thoroughly studied experimental muscle-building compound, tested in real human trials for muscle wasting and cancer-related weight loss. Trials showed real gains in muscle and physical function taken as a pill rather than an injection, but it also lowered natural testosterone, and it remains unapproved for any use.

Also known as MK-2866, Enobosarm, GTx-024, O3571H3R8N, MK 2866, enobosarmum, RefChem:136966, Enobosarm [USAN]

Effects Build muscle Heal

Routes Oral

Legal status Research chemical

WADA Banned at all times

Molecular Structure of C₁₉H₁₄F₃N₃O₃

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Chemistry

Formula: C19H14F3N3O3
Molar mass: 389.3
CAS: 841205-47-8
PubChem CID: 11326715
IUPAC name: (2S)-3-(4-cyanophenoxy)-N-[4-cyano-3-(trifluoromethyl)phenyl]-2-hydroxy-2-methylpropanamide
InChIKey: JNGVJMBLXIUVRD-SFHVURJKSA-N

Reported dosing

User-reported

What has been reported in the literature and by users. This is a record of what is done, not a recommendation.

Typical dose 10-25 mg/day

Reported range 3-30 mg/day

Route Oral

Frequency Once daily

Duration 6-8 week cycles (unregulated use)

Also known as MK-2866/enobosarm; the most-studied SARM, still in FDA clinical trials for muscle wasting (cancer cachexia) but not approved for any use. Not legal in FDA-regulated dietary supplements, and has been linked to suppressed natural testosterone even at moderate doses.

Where this comes from Published Phase II clinical trial data; user-reported/research-chemical vendor literature

There is no approved human dosing for this compound. The figures above are what users and vendors report, not what has been established as safe or effective. Treat them as a record of what is done, not as guidance.