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 |
C₂₅H₃₄O₆ |
| Purity |
≥99% by HPLC — every batch |
| CAS Number |
1370003-76-1 |
| Molecular Weight |
MS molecular weight confirmed — every batch |
| Specification |
≥99% by HPLC — every batch |
| Shelf Life |
24 months unopened |
| Storage |
Room temperature sealed | cool, dry storage |
| Manufacture |
In-house synthesis — Qingdao, China |
| Brand |
China |
Frequently Asked Questions
How do I reconstitute this peptide?
QSC 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 this peptide 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 is this QSC compound and how is it verified?
QSC 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 QSC's free
peptide calculators — reconstitution, BAC water, dosing, half-life, and mixing charts.
🌍 Domestic shipping: 🇺🇸 USA 5–7 days
🌏 International shipping: 7–14 days
⚠️ RESEARCH USE ONLY — NOT FOR HUMAN CONSUMPTION
QSC products are strictly for in vitro and in vivo laboratory research.
Safety & Handling
🚫
Not for Human Use
These compounds are for research only.
🥽
PPE Required
Always use appropriate protective equipment.
❄️
Storage Compliance
Follow product-specific storage conditions.
Product-Specific Storage
Room temperature sealed | cool, dry storage
