YK11: Dosage, Stacking, Cycling, Legality

  • calender Apr 24, 2019
  • author by Boss Peptides & SARMS
YK11: Dosage, Stacking, Cycling, Legality

YK-11 Myostine is one of the most popular SARMs in the market. It’s the best SARM to take if you are looking for fast muscle mass increase that pushes beyond your physiological capabilities. There are several SARMs available that you can use for bulking that is similar to YK-11. However, what sets YK-11 apart from is that its effect remains even after cycling.

What is YK-11 Myostine

YK11 Myostine is a compound based on 5-α-dihydrotestosterone, a stronger form of testosterone. The chemical structure of Myostine is unique, and there is limited research available to fully classify if it’s a SARM or a myostatin inhibitor.

Regardless of its classification, it’s still gaining the interest of bodybuilders because of its unique ability to push your body into forming new muscles beyond its genetic predisposition.

Mechanism of action

We mentioned genetic predisposition. Ever wonder why no matter how much you eat or how intense your workout is, you’re still not gaining the same bulk as Arnold Schwarzenegger, Flex Wheeler, or Branch Warren? These guys are genetically gifted to build muscle bulk. It’s hard for ordinary people to get to that size because something is controlling muscle growth, and that is myostatin.

Myostatin is a protein that inhibits muscle growth and differentiation, and its action is encoded in the MSTN gene. If there’s a loss-of-function mutation on the MSTN gene, myostatin is inactivated, causing the formation of hard, well-differentiated muscles. Such a phenomenon is observed in a child with observed myostatin gene deletion.

YK11 is a potent myostatin inhibitor. It acts by increasing the follistatin levels, a protein that suppresses the action of myostatin. By inhibiting the action of myostatin, you’re able to bulk up beyond your physical limits. No other SARM can suppress myostatin the way YK-11 can.

YK11 Benefits

One major benefit of YK-11 is that it does not have the same side effects as anabolic steroids, even if it shares similar compound qualities. You’ll be able to bulk up without the dreaded water retention, so all you have is pure, lean muscle growth.

As your muscle grows, your basal metabolic rate also rises. This, in turn, helps you burn fat and prevent catabolism during your cutting cycle.

YK11 Effects to expect

One major effect of YK-11 is its anabolic effect on muscle growth, which is totally different from other SARMs or steroids. By increasing Follistatin expression, there is inhibition of myostatin that provides supraphysiological muscle gains.

There is also evidence that YK-11 is capable of up-regulating osteoblastic proliferation and differentiation. Your bones will develop harder and denser, which makes YK-11 a promising treatment against osteoporosis and degenerative bone conditions.

YK11 Dosage

Due to limited research, it’s very important that you take YK-11 dosage with caution. Researchers testing the compound recommend that men should take 2mg-5mg a day, split into two dosages. Women are suggested to take 0.5mg-2mg per day to prevent virilization.

Stick to the recommended dosage to prevent the risk of side effects associated with using chemical compounds.


There are limited data available that provides an established record of YK-1’s half-life. Some suggest that YK-11 has a half-life of 6-8 hours.


Stacking with YK11 should be done with caution, and even not advisable due to limited research on its effects.
However, some researchers recommend stacking it with RAD-140 or Andarine, provided that you lower your YK-11 dose to 5mg per day.


Recommended cycling of YK-11 for bulking is 8 weeks. Anecdotal reports say that you can gain as much as 10lbs-15lbs of muscle during the cycle.

YK11 is also suitable for cutting cycles because of its anabolic effects. You can expect about 5-10 lbs of muscle gain and fat loss during your cycle.


Post cycle therapy is still recommended after using YK-11. All the more since there’s very limited research on the prolonged use of YK-11 and its effects post cycle.


The World Anti-Doping Agency classified YK-11 as a banned substance for competing bodybuilders and athletes. There’s still a bit of gray area with regards to selling and purchasing YK-11. However, you can purchase YK-11 legally as research compounds.

Side effects

Some report little to no side effects when using YK-11. However, there are those who still experience sides due to sensitivity and misuse. Common side effects include:

  • Testosterone suppression – YK-11’s testosterone suppression is dose dependent. Meaning the higher the dose and the longer the cycle, the higher the suppression.
  • Liver toxicity – anecdotal reports suggest that YK-11 elevates liver enzymes, showing possible effects of liver toxicity.
  • Joint and tendon effects – some reports weakness around the joints and tendons as well as the presence of pain and/or discomfort. Some attribute it to cortisol regulation as well as the absence of myostatin. Also, aside from growth regulation, myostatin plays a vital role in tendon maintenance and repair.
  • Aggression – among other sides experienced with YK11, many report marked increase in aggression levels.

YK-11 has shown great potential for increasing muscle bulk by pushing past your genetic boundaries. It shows excellent effects on building muscle mass as well as bone density. As a result, YK-11 helps you push your workout with less risk of bone injury. The added muscle bulk provides you with more energy and endurance so you can do your workouts longer. As with other SARMs, you should support your YK-11 cycle with proper nutrition and strength training.

What got you interested in YK-11? What’s your target goal with your cycle? Please share your fitness goals and plans in our comment section!

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