1
Induced significant increases in myogenic differentiation and myosin heavy chain expression compared to DHT in C2C12 myoblasts.
View on PubMed →
YK-11 Solution
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YK-11 (Myostine) is a structurally unique steroidal SARM with a dual mechanism of action: partial androgen receptor agonism combined with myostatin inhibition via upregulation of follistatin. In vitro studies showed YK-11 induced significant increases in myogenic differentiation compared to DHT.
Every batch is independently tested by a 3rd party laboratory. Certificate of Analysis available below.
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United KingdomRoyal Mail tracked, no customs
Buying in the UK: fast, secure domestic delivery
This YK-11 solution is held in stock in our UK warehouse and travels by Royal Mail tracked: a short domestic journey, with no customs involved. Prices are shown in GBP with UK VAT included, so the price on this page is the price paid. UK payments: card and bank transfer (see how to pay).
United StatesTracked, 100% delivery rate
Buying in the USA: shipped from the UK, priced in USD
Orders from the United States ship from the same UK warehouse with tracked international delivery and a 100% delivery rate: we have never had a parcel held at US customs. You pay in USD, by card, crypto or bank transfer, and every bottle comes from the same independently tested batch as the UK orders.
Switzerland and rest of world100% guaranteed delivery
Buying from Switzerland and the rest of the world
Every international parcel is prepared with care to clear customs smoothly, and the vast majority arrive without any delay. If a delivery ever goes wrong, we reship your order or refund it: you are never left without your parcel or your money.
Ordering from inside the European Union? The same product is stocked in our EU warehouse with no customs: see the YK-11 EU page.
Worldwide ShippingUK · EU · USA · Asia
3rd Party TestedIndependent lab CoA
≥96% HPLC PurityVerified per batch
Safe DeliveryDiscreet packaging
Research Overview
About this compound
What does the research say?
YK-11 is structurally distinct from other SARMs: it is based on a 19-nortestosterone backbone rather than a non-steroidal scaffold. In C2C12 myoblast cell studies, YK-11 induced significant increases in myogenic differentiation and myosin heavy chain expression compared to DHT, while simultaneously upregulating follistatin mRNA, a natural antagonist of myostatin.
Myostatin is a negative regulator of muscle growth. By upregulating follistatin, YK-11 effectively removes one of the biological brakes on muscle development. This dual mechanism (AR agonism + myostatin inhibition) is unique among SARMs. Published research has also investigated YK-11 as a potential preventive agent for sepsis-related muscle wasting, showing decreased mortality and reduced pro-inflammatory cytokine levels.
These are not marketing claims. These are peer-reviewed, published results. You can verify every reference below.
Why does quality matter with YK-11?
YK-11's steroidal structure makes it susceptible to degradation if improperly stored or synthesised. Accurate purity verification is essential to ensure biological activity.
At Camo Chem, every batch is tested by an independent 3rd party laboratory. We publish the full Certificate of Analysis for every batch, and you can verify the results directly with the lab. We do not self-certify. Ever.
Ask your current supplier: who tests their products?
Technical Data
Compound specifications
| Common Names | YK-11, YK11, Myostine |
| CAS Number | 431579-34-9 |
| Molecular Formula | C₂₅H₃₄O₆ |
| Molecular Weight | 430.54 g/mol |
| Classification | Steroidal SARM / Myostatin inhibitor |
| Purity | ≥96% (HPLC verified) |
| Form & Concentration | Solution in PEG-400/DMSO, 15mg/ml, 30ml bottle |
| Ingredients | PEG-400, DMSO, YK-11 |
| Storage | Cool, dry place. Keep sealed. Avoid direct sunlight. |
Peer-reviewed Studies
Published research on YK-11
2
Upregulated follistatin mRNA, a natural myostatin antagonist, suggesting a dual anabolic mechanism.
View on PubMed →3
Inhibited myostatin, reduced pro-inflammatory cytokines, and decreased mortality in sepsis models.
View on PubMed →
Customer Reviews
What researchers are saying
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★★★★★
Good customer service. My lab rat has experimented with a lot of different labs, these are by far the best and to be trusted the most. My rat (he can talk) told me it works great and has noticed strength/endurance gains despite it being the 2nd day. If you live in the UK. I wouldn’t bother looking anywhere else CamoChem is best bet.
★★★★★
Awesome Quality Research Product and Great Price
FAQ
Frequently asked questions
YK-11 is a steroidal selective androgen receptor modulator (SARM) with CAS number 431579-34-9. Unlike other SARMs, it has a dual mechanism: partial androgen receptor agonism and myostatin inhibition via follistatin upregulation. It is sold exclusively as a research compound.
YK-11 has a steroidal backbone based on 19-nortestosterone, unlike most SARMs which are non-steroidal. Its unique dual mechanism combines androgen receptor activity with myostatin inhibition, a pathway not shared by any other SARM.
Every batch meets a minimum of 96% purity as verified by HPLC. Testing is performed by an independent 3rd party laboratory. The CoA is available on this page.
By an independent laboratory with no commercial relationship with our company. We do not self-certify. Our CoAs are verifiable directly with the testing lab.
Store in a cool, dry place away from direct sunlight. Keep the bottle tightly sealed.
