QSC RESEARCH GRADE
≥99% HPLC PurityMS ConfirmedJanoshik COAIn-House SPPS1-Region Domestic Shipping
What is YK11?
YK11 is a steroidal myostatin inhibitor and partial androgen receptor agonist with a unique dual mechanism. As a myostatin inhibitor, it induces follistatin expression — blocking myostatin’s (GDF-8) anti-anabolic activity. As a partial AR agonist, it contributes anabolic gene activation. This dual-action profile makes YK11 a distinctive research compound for myostatin biology, muscle growth regulation, and SARM-adjacent pharmacology. Research use only.
Research Applications
Myostatin Inhibition
Follistatin upregulation, GDF-8 pathway suppression, muscle mass ceiling studies
Dual Mechanism Research
AR partial agonism + myostatin inhibition — combined vs isolated effect dissection
Muscle Growth Regulation
Satellite cell activation, myofibre hypertrophy without myostatin constraint
Follistatin Biology
Follistatin induction mechanism, downstream signalling, ActRIIB pathway
Comparative Myostatin Inhibition
YK11 vs follistatin, anti-myostatin antibodies, ActRIIB decoys
Quick Specs
| Form | Tablet — 10mg per tablet, 100-tablet bottle |
| CAS Number | 1370003-76-1 |
| Molecular Formula | C₂₅H₃₄O₆ |
| Molecular Weight | 430.5 g/mol |
| Compound Type | Myostatin Inhibitor / Partial AR Agonist (SARM-like) |
| Purity | ≥99% by HPLC — every batch |
| Identity | MS molecular weight confirmed — every batch |
| COA | Janoshik-independent, publicly verifiable |
| Manufacture | In-house synthesis — Qingdao, China |
| Storage | Room temperature sealed | cool, dry storage |
| Shelf Life | 24 months unopened |
