YK-11

Description

YK-11 is a synthetic steroidal selective androgen receptor modulator (SARM)-related compound that has attracted significant research interest due to its distinctive pharmacological profile. YK-11 has been reported to function as a partial agonist of the androgen receptor while also influencing molecular pathways associated with myostatin and follistatin regulation. Although it is frequently categorized as a SARM, its steroidal chemical structure distinguishes it from the nonsteroidal SARMs commonly investigated in preclinical research.

Current experimental evidence suggests that YK-11 interacts with the androgen receptor to regulate gene transcription while promoting increased expression of follistatin in cultured muscle cells. Follistatin is an endogenous glycoprotein that binds and neutralizes members of the transforming growth factor-beta (TGF-β) superfamily, including myostatin (growth differentiation factor 8, GDF-8), a negative regulator of skeletal muscle growth. Through this mechanism, YK-11 has been investigated for its potential influence on skeletal muscle differentiation and hypertrophy in laboratory models.

Product Information

✅ Each bottle contains 60 tablets
✅ Each tablet delivers a potent dose of YK-11
✅ A unique SARM with myostatin-inhibiting properties for extreme muscle gains

What Is It Used For and Its Purpose 

YK-11 is primarily investigated as a research compound for studying androgen receptor signaling and the molecular regulation of skeletal muscle growth. Researchers utilize YK-11 to examine how modulation of androgen-responsive genes may influence muscle cell differentiation, protein synthesis, and the balance between anabolic and catabolic signaling pathways.

Particular scientific interest centers on its reported ability to increase follistatin expression, which may reduce the biological activity of myostatin. Because myostatin serves as a negative regulator of skeletal muscle development, modulation of the follistatin–myostatin axis has become an important area of investigation in muscle biology and regenerative medicine research.

Current research also explores the relationship between androgen receptor activation, muscle hypertrophy, satellite cell biology, and intracellular signaling pathways involved in skeletal muscle adaptation.

Research Applications

• Skeletal muscle biology
• Androgen receptor signaling
• Myostatin pathway research
• Follistatin biology
• Muscle hypertrophy research
• Cell differentiation
• Protein synthesis regulation
• Regenerative medicine
• Molecular endocrinology
• Translational pharmacology

Potential Scientific Benefits 

Published studies have demonstrated that YK-11 can activate androgen receptor-mediated transcription while increasing follistatin expression in cultured muscle cells. These findings have generated interest in understanding how androgen signaling interacts with regulators of skeletal muscle growth and differentiation. Experimental evidence suggests that increased follistatin expression may reduce myostatin signaling, potentially creating a cellular environment that favors muscle protein accretion and myogenic differentiation.

Compared with many investigational SARMs, the biological profile of YK-11 remains incompletely characterized. Limited published studies and the absence of controlled clinical trials mean that its pharmacokinetics, tissue selectivity, long-term biological effects, and safety profile remain uncertain. Claims regarding muscle growth beyond genetically determined limits have not been established through robust clinical evidence.

The compound continues to serve as a valuable experimental tool for investigating androgen receptor pharmacology, skeletal muscle signaling, and regulation of the follistatin–myostatin pathway. Ongoing research seeks to better define its molecular mechanisms and potential applications in muscle physiology.

Reported Biological Findings in Research

• Partial activation of androgen receptor signaling
• Increased follistatin expression in cultured muscle cells
• Indirect modulation of myostatin signaling through follistatin
• Investigation of skeletal muscle differentiation
• Evaluation of anabolic gene transcription
• Study of muscle protein synthesis pathways
• Research into myogenic cellular signaling
• Experimental investigation of muscle hypertrophy mechanisms

Current scientific evidence remains limited, and further well-controlled clinical studies are required to establish long-term efficacy and safety in humans.

Research Data Sheet 

The following summarizes the currently available research information for YK-11.

• Compound / Peptide Name: YK-11
• Sequence: Not applicable
• Classification: Synthetic steroidal androgen receptor modulator (SARM-related investigational compound)
• Molecular Formula: C₂₅H₃₄O₆
• Form: Liquid solution
• Appearance: Not available
• Purity: 99%
• Solubility: Research-dependent
• Research Categories: Skeletal Muscle Biology, Androgen Receptor Signaling, Myostatin Research, Follistatin Biology, Molecular Endocrinology, Regenerative Medicine, Translational Pharmacology

Safety Precautions 

YK-11 is supplied strictly as an investigational research compound and should only be handled by qualified laboratory personnel using appropriate laboratory procedures. It is not approved for therapeutic or clinical use, and comprehensive human safety data are currently unavailable.

• Research use only
• Not for human consumption
• Not intended to diagnose, treat, or prevent disease
• Wear appropriate personal protective equipment (gloves, laboratory coat, and eye protection)
• Follow aseptic handling procedures where applicable
• Store according to manufacturer recommendations
• Avoid repeated freeze–thaw cycles if prepared in solution
• Maintain appropriate labeling and laboratory documentation
• Dispose of waste in accordance with institutional and local regulations
• Human safety data remain limited
• Long-term biological effects have not been fully characterized

Conclusion 

YK-11 is a steroidal androgen receptor modulator that has become an important subject of investigation within skeletal muscle and molecular endocrinology research. Its reported ability to increase follistatin expression while modulating androgen receptor signaling distinguishes it from many other investigational compounds in this category.