YK11: Medical Research & Benefits

Due to its dual nature as a SARM and a myostatin inhibitor, YK11 is likely one of the most potent SARMs on the market today.

YK-11 is a SARM that promotes lean muscle growth while simultaneously inhibiting myostatin, allowing you to reach your full bodybuilding potential.

Is YK11, on the other hand, risk-free? What is the ideal bodybuilding dosage? What kind of outcomes can you anticipate? How long does a normal cycle last?

We will review the research and anecdotal evidence in this article to provide you with the facts regarding YK-11 so you can make an informed decision.

What Exactly is YK11?

YK11 is a member of the SARMS class of research compounds, which were initially created to help cancer patients with muscle wasting.

SARMs, or selective androgen receptor modulators, are strong muscle builders that are generally well tolerated.

Bodybuilders immediately discovered that healthy people who took SARMs might experience steroid-like effects, even though they were initially designed to help cancer patients overcome muscle loss.

While there isn’t much clinical research to back up YK-11’s claims, anecdotal evidence says it’s a powerful muscle-building supplement.

In fact, as we’ll see shortly, lab rats given YK-11 as a therapy had absolutely incredible muscle growth and results.

Overview of Advantages and Cons of YK11

Before diving into the clinical trials for YK11, let’s take a look at the positives and drawbacks of this intriguing new research chemical:


  • Extremely effective
  • Rapid Muscle Growth
  • Significant boost in strength
  • A Fantastic Bulking Compound


  • More research is required.
  • Some People’s Potential Side Effects
  • Requires Post Cycle Therapy

While there are currently no clinical trials, both anecdotal evidence and existing cell-based research suggest that YK-11 has a powerful anabolic effect on muscle growth.

Is YK11 Legal?

The World Anti-Doping Agency (WADA) has classified YK-11 and other SARMs as anabolic substances, making them illegal in athletic competitions such as the Olympics.

SARMs have also been banned from use in athletic competitions by the United States Anti-Doping Agency, or USADA for short, demonstrating their effectiveness. So if you’re an athlete, you may be tested for these drugs and face some hefty fines or even a ban. However, if you’re not, you won’t experience any legal consequences.

Other than that, it is perfectly legal to buy and sell YK-11 on the internet, but we recommend that you do so through a reputable vendor.

How Does YK11 Work?

YK11, like other SARMs like Ostarine, operates by attaching to androgen receptors in the body and signaling the growth of skeletal muscles.

YK-11, on the other hand, is unique in that it is both a SARM and a myostatin inhibitor, giving it an additional anabolic impact.

It accomplishes this by attaching to androgen receptors and causing muscle cells to generate more follistatin, which suppresses the formation of myostatin.

Myostatin is a protein produced by your body that limits how much muscle you can grow naturally—YK11 blocks myostatin production, allowing you to reach your genetic potential.

Some of the world’s most potent and largest bodybuilders have been discovered to have a gene that prevents their bodies from producing myostatin, allowing them to achieve incredible sizes and strength.

To put it another way, YK-11 removes the “muscle growth limit” that your body imposes on itself, allowing users to make quick increases.

In effect, this is what YK-11 accomplishes. This substance not only has the muscle-building properties of a SARM, but it also lowers the quantity of myostatin in your body, allowing it to go beyond its natural muscle-building capability.

The Benefits of Using YK11 Explained

There are limited studies on the effects of YK-11 on people, but we do know that this SARM has a strong anabolic effect on animals.

In fact, studies show mice with low levels of myostatin, which is caused by YK-11, have twice as much muscle mass as rats with high levels.

The following are some of the reported advantages of using YK-11:

Rapid Increase in Muscle Mass

YK-11 is the supplement to use if you want to build strong and toned muscles.

When muscle tissues are subjected to YK-11, they appear to have strong anabolic effects, which are substantially stronger than the results achieved when muscle tissues are exposed to DHT.

Inhibition of myostatin and an increase in follistatin levels have a significant impact in this area.

YK-11 can enhance muscle mass growth even more thanks to these two events.

Hardening of Muscles

Another reason people like YK11 is because it has a muscle-hardening effect that only a few other supplements can match.

Aside from the quick muscle growth, YK-11 is known for giving lifters the “cut and dry” aesthetic they crave.

Furthermore, combining YK-11 with SR9011 or another cutting-oriented SARM could result in extremely rapid and lean increases.

Increased Strength Gains

The majority of people take this supplement because of its capacity to boost users’ power quickly. In fact, a study conducted at Yale University’s Department of Internal Medicine discovered that giving mice an anti-myostatin medication for just four weeks resulted in a significant improvement in muscle strength.

Another study published in the PNAS Journal discovered that animals lacking the myostatin inhibitory gene (which YK-11 appears to turn off) had literally twice the physical strength of mice with the gene.

While additional research is needed, preliminary data and anecdotal evidence suggest it is an EXTREMELY effective muscle-building substance, rivaling even the most powerful anabolic steroids.

Dosage Recommendations for YK11

We’re going on anecdotal evidence when it comes to YK-11 doses. It’s a powerful chemical, as previously said. When compared milligram for milligram, it may even be more robust than RAD140 (Testolone).

In general, a good YK-11 dosage ranges from 5 to 10mg per day for optimal outcomes. And depending on your goals, a cycle can take anywhere from 4 to 8 weeks. And, to be honest, that’s all you need. If you take more than 10mg, you can experience some adverse side effects.

It’s preferable to start slowly with 5-10mg per day and make considerable improvement with no problems.

Because it may be liver toxic, you will require to Defend cycle support during the cycle.

After the cycle, run Rebirth PCT to aid in your recovery. It’s a highly effective post-cycle therapy supplement that you’ll require. The preceding assertions are based on anecdotal evidence and are not supported by clinical evidence.

YK11 Stacks for Bulking and Cutting

The YK11 MK 677 stack is the most popular YK-11 stack, and for a good reason. As previously stated, YK-11 provides excellent muscle and strength improvements as well as fat loss.

MK 677 is a great match for it. It also possesses fat-burning and muscle-building properties. Not only that but taking MK 677 first thing in the morning will make you hungry. If you’re aiming to gain weight, this is ideal. Take it in the evening if you wish to avoid this.

Overall, this is a fantastic cycle, and the majority of users appear to agree. The fact that MK 677 is non-hormonal is perhaps the finest part about this stack. To put it another way, it won’t create any more suppression.

What are Some of the Potential Side Effects of Using YK11?

Because there have been no human studies on the safety of YK-11 use, the majority of the reported side effects come from bodybuilding cycle logs.

In the short term, some users report no side effects, while others report numerous side effects.

The following are some possible YK-11 side effects:

  • Testosterone suppression
  • Toxicity of the Liver in a Mild Form
  • Tendon and Joint Pain
  • Aggression

Testosterone suppression is the most visible negative effect of YK-11 use, although this is true of all SARMs, from SR9009 through the S23 SARM.

Supplements for tendon pain and liver support, as well as a proper PCT, can help to reduce the negative effects of YK-11.

For those who are sensitive to hair loss caused by SARMs, we recommend using RU58841 throughout your cycle.

Is YK11 Really Safe?

While there isn’t much clinical evidence to support the safety of YK11, there are plenty of anecdotal reports from users and bodybuilders who claim to be fine.

It’s important to note that the FDA has not approved YK-11 for human use, and more research on the long-term potential side effects is needed.

If you do decide to cycle YK-11, make sure to use a good SARMs PCT to maintain your gains and ensure a high testosterone level.


To summarize, YK11 is a potent myostatin inhibitor that promotes rapid muscle growth and strength in those who take it. While the FDA has not approved it for human usage, many bodybuilders still take it for its insane performance benefits.

If you want to buy 99 percent pure 3rd party tested YK-11 for research, we recommend Science Bio. This is because every batch of their SARMs is tested for purity by a third party.

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