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Kevinn Khoo

YK 11 has the property that will induces muscle cells, causing them to make more follistatin – a strong myostatin inhibitor. Myostatin can limited muscle growth. This is way more then when compared to DHT which is a very strong myostatin inhibitor. YK 11 also works through the androgen receptor as well so this is something else you need to keep in mind when you are using them for the very first time. That being said, YK 11 is as good as testosterone when you look at how much strength it can add to your muscles and it doesn’t give you any of the detrimental side effects as well.

  • Intensive growth of muscle mass without a rollback phenomenon

  • Fat burning

  • Preventing the loss of muscle mass during weight loss and drying

  • Improvement of individual power and speed parameters

  • Increase endurance

  • Biochemical and physiological preventing neuronal damage

  • Improvement of blood circulation

  • Slowing the aging process of cells

As a relatively new compound, exactly how YK11 works to improve lean muscle mass in humans can only be discussed based on intial in vitro studies.

However, what we do know is that YK11 may be a Myostatin blocker – essentially allowing users to reap continuous gains without stalling and requiring a break in a cycle.

Myostatin is a protein that is released to limit muscle growth to ensure they do not get ‘too large’. It is found predominantly in skeletal muscle, and studies show that individuals with a gene mutation that limits Myostatin production are both stronger and more muscular than those with normal amounts.

YK11 may help to inhibit the production of Myostatin in muscles by attaching itself to the Androgen Receptor. From there, it may induce muscles to create more Follistatin, which in turn limits the levels of Myostatin, allowing increased muscle growth beyond genetic capability.

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

  1. YK11 may block Myostatin, allowing continues lean body mass gains

The primary benefit of YK11 and the reason it shows huge promise in the bodybuilding world is its potential to activate more Follistatin in muscles, subsequently blocking the production of Myostatin. By blocking Myostatin, a user could potentially unleash huge gains with continuous muscle growth. 

  1. YK11 may be comparable to testosterone in its ability to build strength in muscles

It’s a commonly held belief that while SARMs produce less negative side effects than testosterone, they’re also less effective at creating an anabolic effect in muscle growth.

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 less side effects than steroids.

  1. YK11 shows potential for fast, large gains

Many users  in USA including Malaysia report seeing results from YK11 in as little as a single week of use, with the amazing results after an eight-week cycle.

Side Effects

YK11 has only been tested in vitro – meaning that it has been tested on cells in a petri dish rather than on live animals or humans – where it has shown great promise in building lean muscle mass. However, this also means that until animal or human trials are conducted, we will not know what the potential side effects may be.

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.



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. Sarms4you sells capsulated and powder YK11 so you can easily decide what kinda dosage you need. The capsules come in 5mg, that means you can take 1-2 caps a day.  1 in the morning and 1 in the evening.

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.


Most users of YK11 are very satisfied with the results they have gotten from their cycle. The sweet spot for YK11 seems to be around 20mg for most users. People who have ran different SARMs in the past are amazed at what YK11 did to their bodies. Overall the reviews are very positive and users report losing bodyfat whilst gaining lean muscle, which is absolutely crazy to think about. Other users often stack YK-11 with other SARMs such as RAD-140 and MK-677 causing a synergic effect when combined.

Stacking YK11 with other SARMs 

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

Users report increased strength and an increase in lean muscle mass similar to testosterone results but without the water bloat. It works great for users looking to bulk with lean, dry gains.

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