SARMs
YK-11
YK-11 is a myostatin-inhibiting SARM studied in muscle-growth research. Below, we compare vendors currently stocking research-grade YK-11 — not just a single sales page.
YK-11 is a myostatin-inhibiting SARM studied in muscle-growth research. Below, we compare vendors currently stocking research-grade YK-11 — not just a single sales page.
Prices and testing claims are pulled from each vendor's product listing. Always confirm current price and COA (Certificate of Analysis) on the vendor's site before buying.
| Vendor | Price | Purity Testing | Code | |
|---|---|---|---|---|
 Next ChemBest Value |
$68.95 | Third-party COA | Auto-applied | Buy Here → |
 UK Sarms |
£54.97 | Third-party COA | Auto-applied | Buy Here → |
 MuscleChem |
£54.99 | In-house testing | Buy Here → | |
 SwissChems |
$79.95 | Third-party COA | Buy Here → | |
 Chemyo |
$79.99 (10mg/ml solution) | Third-party COA | Buy Here → |
YK-11 is a synthetic steroidal compound studied as a partial androgen receptor agonist with additional reported activity as a myostatin inhibitor, making its proposed mechanism distinct from the nonsteroidal SARMs it is often grouped with commercially.
Research-grade YK-11 is typically supplied as capsules or a liquid solution, commonly at 5mg or 10mg per dose, intended for laboratory research use only.
YK-11 is studied for activating the androgen receptor while also increasing expression of follistatin, a protein that inhibits myostatin — a negative regulator of muscle growth — giving YK-11 a proposed dual mechanism distinct from receptor-selective SARMs alone.
In-vitro studies have investigated YK-11's effect on follistatin expression and myostatin inhibition in muscle cell cultures, which is the basis for research-community interest in it as a potentially more potent anabolic signal than androgen receptor activation alone.
Because YK-11 is structurally a steroid rather than the nonsteroidal chemotype of most SARMs, it is sometimes studied separately as a distinct structural class within androgen receptor modulator research.
YK-11's published research is limited almost entirely to in-vitro (cell culture) studies rather than animal or human trials. It has no established human safety data, has never been evaluated in human clinical trials, and is not FDA-approved.
No dosage of any kind has been clinically validated for YK-11 in humans or animals in vivo. Any protocols circulating in research-community sources are not supported by peer-reviewed in-vivo or clinical trial data.
Compound X does not sell YK-11 directly. We provide independent research, comparisons and vendor links — see the vendor comparison table above for current US, UK, Canada and Australia options.
YK-11 in-vitro research is indexed on PubMed under search terms such as "YK11 myostatin follistatin androgen receptor."
New guides, vendor comparisons and compound breakdowns every week.