306 In the index

YK-11 YK-11

A compound marketed as an experimental muscle-building compound but that actually seems to work partly by blocking a natural muscle-growth limiter, studied only in lab-dish and cell research. It has no human clinical trial data at all, despite being one of the more talked-about compounds in research-chemical bodybuilding circles.

Also known as YK11, Z9748J6B0R, RefChem:195653, YK11 cpd, EX-A727, Q27295178

Effects Build muscle

Routes Oral

Legal status Research chemical

WADA Banned at all times

3D Molecular Structure of C₂₅H₃₄O₆

Drag to rotate · scroll to zoom

Chemistry

Formula: C25H34O6
Molar mass: 430.5
CAS: 1370003-76-1
PubChem CID: 119058028
IUPAC name: methyl (2E)-2-[(8R,9S,10R,13S,14S,17S)-2'-methoxy-2',13-dimethyl-3-oxospiro[1,2,6,7,8,9,10,11,12,14,15,16-dodecahydrocyclopenta[a]phenanthrene-17,5'-1,3-dioxolane]-4'-ylidene]acetate
InChIKey: KCQHQCDHFVGNMK-PQUNLUOYSA-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 5-10 mg/day

Reported range 5-20 mg/day

Route Oral

Frequency Once daily

Duration 6-8 week cycles (unregulated use)

Marketed as an experimental muscle-building compound that appears to work partly by blocking a natural muscle-growth limiter (myostatin), studied only in lab-dish and cell research. No human clinical trial data exists at all, despite being widely sold as a research chemical.

Where this comes from Cell/lab studies only; 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.