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Myostine (YK11)

CAS No : 1370003-76-1
Molecular formula : C25H34O6
Molecular weight : 430.541
Appearance : White to off-white solid powder
Assay : 99%min
Delivery time : 5-7 business days door-to-door
Minimum order : 100g
Supply ability : 100KG/month
Quality standard : Enterprise standard

Product Description

YK11, also known as Myostine, is a considered one of the strongest SARMs on the market. YK11 has a powerful anabolic activity similar to steroids.

YK11 is a new synthetic steroid based on 5-α-dihydrotestosterone (DHT), a hormone naturally found in the human body. DHT is a stronger form of testosterone that targets androgen receptors in the prostate, sex organs, hair, and liver.

YK11 is gaining interest from bodybuilders due to its ability to quickly build muscle with minimal side effects, much like various SARMs.

How does YK11 Work?

The chemical structure of YK11 is similar to DHT and it binds to androgen receptors in a similar way. DHT is a naturally occurring hormone in the body, crucial for hair growth, prostate health, proper development in puberty.

YK11 is also a myostatin inhibitor. A recent cell study uncovered the basis of YK's unique muscle-building mechanism: increasing follistatin levels. Follistatin is a naturally occurring protein in that suppresses myostatin, which otherwise prevents muscles from getting too large. In comparison, no other SARMs show myostatin inhibition.

YK11 also helps muscle cells produce large amounts of follistatin, which is another compound that’s necessary for the growth of muscle cells.

Benefits of YK11

There are 3 primary benefits that have been observed in both initial studies and user-reported reviews of YK11.

1 Increase muscle mass

YK-11 is primarily developed to help people who are hoping to increase their muscle mass. It works in several different ways to support muscle cells and help the body retain muscle that is already there.

2 Burning fat

YK11 helps the body burn fat. It also makes it more difficult for fat to be stored in the body. As an even further benefit, the body tends to burn more calories when there is more muscle mass, so YK11 can truly help to turn your body into a fat-burning machine.

3 Build strength in muscles

Initial studies show that muscle cells produce more anabolic factors when exposed to YK11 than they do when exposed to DHT (testosterone). This suggests that YK11 is potentially more powerful than testosterone at producing impressive gains with fewer side effects than steroids.

What's the Best YK11 Dosages?

User reviews suggest that the ideal human dosage for YK11 is 2-5mg twice per day for eight weeks (a total of 5-10mg per day for men). The dosage can be split up in 2 times a day, depending on what kind of substance you have.  Anecdotally, some users suggest increasing the YK11 dosage to 20mg per day in total over the course of a cycle, although it’s best to start at a lower dosage and find your sweet spot.


5-10mg total per day split into two doses.


0.5-2mg total per day split into two doses.

The half-life of YK11 has not been studied. A popular dosing strategy is to split each daily dose into two. By taking two doses a day, YK11 levels should remain more stable, although there is no clinical evidence to confirm this. Most users take YK11 by mouth, but some people have used muscle injections.

Method of Stacking

There have been quite a few anecdotal reports from users who have stacked YK11 with RAD140 with incredible results.

YK11 is often stacked with LGD-4033. LGD-4033, also called Ligandrol, is known for its ability to gain a lot of lean muscle similar to RAD140. A YK11 LGD stack would be great for gaining lean muscle mass in a short period of time.

Dosages RAD140 YK11 stack:

RAD140 (Testolone) – 15-30mg

YK11 (Myostine) – 5-10mg

Dosages YK11 LGD stack:

LGD-4033 (Ligandrol) – 5-15mg

YK11 (Myostine) – 5-10mg

YK11 Potential Side-effects

YK11 has only been studied in cells so far. There is no available clinical information on side effects. Not even animal studies have been carried out yet.

Anecdotal evidence from individuals who have cycled YK11 suggests that for those prone to hair loss, shedding may occur. Other users have noted zero hair loss, so it may be a case-by-case situation based on each individual.

Other anecdotal evidence suggests that mild acne may be a side effect of YK11, but this also disappears after a few weeks or once the cycle is complete.

It has also been suggested that YK11 may cause mild, reversible liver damage. This means that any damage caused is repaired by the body once the cycle is complete. Make sure to purchase a cycle support product in order to help protect your liver and other organs.

If you do experience any serious side effects, make sure to stop taking YK11.


YK-11 is particularly useful for people who have genetic defects that make it pretty hard for them to develop muscle. This can help to correct these problems and allow them to build muscle at a higher rate than normal. But, more studies are needed to understand the efficacy and long-term effects of this compound.


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We have an experienced management team and a first-class R&D team, including many outstanding experts in the fields of pharmaceutical synthesis process development and pharmaceutical quality research.

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