What is YK-11 (Myostan)?

YK-11, also known as Myostan, is a synthetic compound that falls halfway between I (Selective Androgen Receptor Modulators) and the myostatin inhibitors. This dual action makes it particularly appealing to bodybuilders and athletes seeking advanced muscle growth without resorting to traditional anabolic steroids.

Unlike classic SARMs, YK-11 selectively activates androgen receptors and blocks the biological mechanism that naturally limits muscle development. It stands as a new-generation compound in the field of anabolic research.

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Origin and status of research on YK-11

YK-11 emerged from experimental studies focused on strategies to stimulate muscle hypertrophy. However, information regarding its discovery is still limited, and most available data comes from in vitro studies and animal models.
As of today, YK-11 is not approved for medical use and is intended solely for research purposes.

Despite this, interest in YK-11 has grown rapidly thanks to reports describing increases in lean muscle mass, density, and strength.

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Why YK-11 is different from other SARMs

The distinctive feature of YK-11 It’s his dual-action mechanism: the

• Partial agonist of androgen receptors, such as classic SARMs

• Myostatin inhibitor, by increasing follicle-stimulating hormone

The myostatin It is a protein that physiologically limits muscle growth. By reducing its activity, YK-11 removes the brake on muscle development, allowing for growth beyond natural limits.

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Main effects and benefits of YK-11

• Advanced Muscle Growth
  Myostatin inhibition leads to more pronounced hypertrophy than most SARMs.

• Increased muscle density and strength
  The muscles appear more compact, firm, and defined, with no water retention.

• Increase in strength
  YK-11 promotes the development of type II muscle fibers, which are responsible for strength and explosiveness.

• A “dry” and defined look
  No swelling or fluid retention, which is typical of many steroids.

• Indirect Support for Fat Loss
  An increase in lean body mass can improve basal metabolism over time.

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Mechanism of action of YK-11

1. Activation of the androgen receptor

YK-11 binds to androgen receptors in muscle and bone tissue, such as partial agonist, stimulating protein synthesis without the overstimulation typically associated with steroids.

2. Inhibition of myostatin via follistatin

YK-11 increases levels of folistatin, a protein that neutralizes myostatin. This process allows muscle fibers to grow beyond normal physiological limits, promoting greater hypertrophy.

3. Increase in muscle nuclei

The reduction of myostatin allows for the formation of more muscle cell nuclei, increasing protein synthesis capacity and response to intense training.

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Main uses of YK-11

• Advanced muscle mass cycles

• Increased strength and explosive power

• Maintaining lean mass during definition

• Research on muscle wasting conditions (experimental)

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Dosage and method of use (research)

• Beginners: 5 mg per day

• Intermediate: 10 mg per day (divided into 2 doses)

• Advanced: up to 15–20 mg per day (use with caution)

Estimated half-life: 6–10 hours
Recommended cycle duration: 4–8 weeks

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Common combinations (stacks)

• YK-11 + RAD-140 (Testolone) → mass and force

• YK-11 + LGD-4033 (Ligandrol) → volume + density

• YK-11 + MK-677 (Ibutamoren) → Recovery and GH

⚠️ Stacks increase the likelihood of hormonal suppression → Recommended PCT.

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Safety and precautions

• Monitor testosterone, LH, FSH

• Check liver enzymes (ALT, AST)

• Recommended liver support (e.g., TUDCA)

• Avoid cycles longer than 8 weeks

• A diet rich in protein and good hydration

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Possible side effects

• Testosterone suppression

• Liver stress

• Joint pain

• Acne and oily skin

• Mood swings and aggression

• Hair loss (androgen sensitivity)

• Changes in lipid profile

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Storage of YK-11

• Store in a cool, dry place.

• Avoid direct light

• Store at room temperature

• Keep out of reach of children