YK-11 (Myostine)
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YK-11 is a synthetic research compound commonly grouped with SARMs due to its interaction with androgen receptor signaling in experimental models. It is frequently discussed in research contexts for its potential to influence muscle growth related pathways through a combination of androgen receptor mediated activity and downstream effects on myostatin associated signaling. YK-11 is not approved for human or veterinary use and is supplied strictly for laboratory research purposes.
Available Formats
- Dry fill capsules
- 30 mL liquid solution
- 10 mL aliquot vial (MCT oil carrier)
- 1 gram powder
Mechanism of Action
YK-11 is primarily evaluated through two overlapping research themes: androgen receptor signaling and myostatin pathway modulation. Research discussion commonly includes: Because YK-11 is often positioned as a hybrid compound in research discussion, well controlled designs typically require comparator arms including traditional SARMs, androgens, and myostatin pathway comparators for clear attribution.
- Androgen receptor linked transcription effects relevant to anabolic signaling in skeletal muscle paradigms
- Potential upregulation of follistatin expression in some models, a regulatory protein often studied for its relationship to myostatin activity
- Indirect influence on myostatin associated signaling, which is a key regulatory brake on muscle growth in many experimental paradigms
- Downstream shifts in muscle differentiation and hypertrophy related gene expression endpoints
- Performance proxy changes in controlled designs where training stimulus and nutrient availability are standardized
Areas of Investigation
YK-11 is commonly examined in laboratory research related to: Stacking and synergy research designs where multiple anabolic pathways are intentionally combined
- Hypertrophy and muscle differentiation models
- Myostatin and follistatin signaling pathway research
- Lean mass and nutrient partitioning paradigms
- Disuse atrophy and muscle wasting models
- Comparative androgen receptor agonist studies evaluating selectivity and transcription patterns
Safety Profile
Reported observations are model and exposure dependent and may include: As with many androgen pathway compounds, tight controls and standardized monitoring endpoints are important for clean attribution.
- Suppression of endogenous gonadotropin signaling in some paradigms, consistent with androgen receptor agonism
- Changes in lipid related markers in certain model contexts
- Sleep disruption, irritability, or overstimulation adjacent signals at higher exposure levels
- Headache and GI discomfort signals in some models
- Confounded hepatic biomarker interpretation in stacked oral agent paradigms or aggressive exposure designs
For educational purposes only. Not for human consumption.