What is YK-11?
YK-11 is a steroidal myostatin inhibitor and partial AR agonist with a unique dual mechanism — induces follistatin (blocking GDF-8/myostatin anti-anabolic signalling) while providing partial androgenic activity. Research tool for myostatin biology, follistatin induction, and SARM-adjacent muscle growth pharmacology. Research use only.
Research Applications
Myostatin Inhibition
Follistatin induction, GDF-8 pathway suppression, muscle mass ceiling removal
Follistatin Biology
Follistatin mechanism, ActRIIB pathway, downstream myogenic signalling
Dual Mechanism Research
AR partial agonism + myostatin inhibition — isolated vs combined pathway dissection
Muscle Hypertrophy Models
Satellite cell activation without myostatin constraint, fibre size studies
Myostatin vs Follistatin
YK-11 follistatin vs direct anti-myostatin antibodies — comparative effectiveness
Quick Specs
| Form |
C₂₅H₃₄O₆, MW 430.5 |
| 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 raw powder compounds are supplied as bulk crystalline or amorphous powder in a sealed, labelled container at the stated quantity. No reconstitution is required — the powder is ready for weighing and use 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 light. Keep in the original sealed container. Properly stored raw powder remains stable for 2–3 years.
What purity is this QSC compound and how is it verified?
All QSC raw powder compounds are tested to ≥99% purity by HPLC on every production batch, with MS-confirmed identity. 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
