Myobol (YK-11)


CLASSIFICATION: Myostatin inhibitor
DOSAGE: 6mg/Pill



What is YK11?

YK11 is categorized as a steroidal SARM (Selective Androgen Receptor Modulator), specifically recognized as a Myostatin inhibitor. Regarded as one of the most potent SARMs available, it rivals certain steroids in terms of efficacy.

As a SARM, YK11 binds selectively to androgen receptors, distinguishing itself from steroids by avoiding side effects like prostate issues. However, what sets YK11 apart and has garnered recent attention is its role as a Myostatin inhibitor. This makes it an excellent compound for cutting, lean bulking, and body recomposition.

How does YK11 work?

YK11 operates as a Myostatin inhibitor, influencing the balance between Myostatin and Follistatin. Myostatin, a protein that diminishes muscle mass and strength, is counteracted by Follistatin, promoting muscle growth. YK11 enhances Follistatin levels by inhibiting Myostatin, preventing muscle loss and fostering significant muscle gains.

YK11 in sports

Recognized as a prohibited substance by major sports bodies, including the Olympics, YK11 is listed by WADA (World Anti-Doping Agency) and the USADA (United States Anti-Doping Agency) due to its unfair advantages in muscle mass and strength enhancement.

YK11 Benefits

The key benefits of YK11 include:

  1. Increased muscle growth
  2. Strengthened bones
  3. Enhanced strength

YK11 side effects

Users adhering to recommended dosages report remarkable muscle and strength gains with minimal side effects. Some individuals may experience:

  1. Hair loss (often reversible after the cycle)
  2. Mild acne (typically diminishes post-cycle)
  3. Increased aggression
  4. Lower libido (normalizes a few weeks after the cycle)
  5. Rare instances of gyno (mostly at high dosages and prolonged cycles)

It’s important to note that YK11, up to a 30mg dosage, does not cause liver damage. Beyond this dosage, it may pose risks to the liver and other organs.

Dosage and cycle length

Bodybuilders recommend a dosage of 10 to 15 mg per day for 8 weeks, yielding significant results with minimal side effects. Beginners may start with 5 mg per day for 6 to 8 weeks. The half-life of YK11 is approximately 12 hours, necessitating split dosages (morning and evening) to maintain optimal levels.

Hair loss

Pure SARMs like YK11 do not cause hair loss; potential hair-related issues may be attributed to impurities in low-quality products. Procuring YK11 from reputable vendors is crucial to avoid undesired side effects.

Stacking with other SARMs

It’s not advisable to stack YK11 with other SARMs due to its potency and suppressive nature. YK11 alone provides robust results, and stacking may lead to unnecessary receptor occupation and increased suppression.

Stacking with other compounds

YK11 pairs well with non-hormonal compounds like MK 677, Cardarine, and SR9009 for enhanced benefits in fat loss, muscle gains, and endurance. These compounds complement YK11 without additional suppression.


The need for PCT depends on the degree of suppression. Blood tests are the most reliable method to determine if PCT is necessary. Generally, SARMs, including YK11, are not highly suppressive, and the body typically recovers naturally in a few weeks post-cycle.


YK11 stands out as one of the most potent SARMs with muscle and strength gains comparable to certain anabolic steroids. Limited studies and clinical trials are available, but user reports indicate positive results when adhering to recommended dosages and cycle lengths. Opting for high-quality YK11 and following standard usage guidelines are crucial for achieving favorable outcomes while minimizing potential side effects.

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