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
Frequently Asked Questions
How are Vesta research tablets supplied?
Vesta research tablets are supplied as pre-dosed oral tablets at the stated concentration.
No reconstitution is required. Each tablet is compressed at uniform dose for consistent dosing in research applications. How should research tablets be stored?
Store at room temperature (15–25°C) in a cool, dry place away from moisture, heat, and direct sunlight.
Keep in the original container. Properly stored tablets remain stable for 2–3 years. What purity are Vesta research tablets and how is it verified?
Vesta research tablets contain active ingredient at ≥99% HPLC purity before tableting, with MS-confirmed identity on every batch. COA is published on the product page and independently verifiable at verify.janoshik.com. Peptide Research Tools: Use Vesta’s free peptide calculators — reconstitution, BAC water, dosing, half-life, and mixing charts.
International shipping: 7–14 days