YK-11 (360mg/30ml) | The Myostatin Inhibitor SARM

YK-11 is a unique and highly advanced research compound that occupies a rare space between a Selective Androgen Receptor Modulator (SARM) and a Myostatin Inhibitor. Structurally, it is based on a steroidal backbone, but functionally, it acts as a partial androgen receptor agonist. It is primarily researched for its unprecedented ability to increase the production of Follistatin, a naturally occurring protein that inhibits Myostatin (the protein responsible for limiting muscle growth).

Mechanism of Action

YK-11 operates through a dual-action pathway that targets the very limits of muscle genetics:

• Myostatin Inhibition: By stimulating the expression of Follistatin, YK-11 effectively "removes the brakes" from muscle growth, allowing for hypertrophy that exceeds a subject's natural genetic ceiling.

• Selective Androgen Signaling: It binds to androgen receptors to promote bone and muscle growth, though it is considered a partial agonist, meaning it has a lower risk of androgenic side effects compared to full agonists like S-23.

• Osteoblast Differentiation: Research indicates YK-11 significantly boosts levels of bone-specific proteins like Osteocalcin, leading to improved bone mineralization.

• Gene Transcription: It works at the genetic level to induce the expression of myogenic differentiation factors, which are essential for the creation of new muscle cells.

Fitness & Genetic Research Benefits

In advanced hypertrophy research, YK-11 is studied for its ability to bypass traditional biological plateaus:

• Inhibition of Genetic Growth Limits: It is the primary subject for researchers looking to study muscle accumulation in the absence of Myostatin regulation.

• Rapid Muscle Volume Increases: Because it targets a different pathway than most SARMs, research models often show unique "dry" mass gains and extreme muscle fullness.

• Skeletal Strengthening: By increasing bone-building proteins, it is researched for its ability to strengthen the frame to support rapid increases in muscle mass.

• Synergistic Power: YK-11 is frequently studied in combination with other SARMs (like LGD-4033) to explore the relationship between androgen receptor activation and Myostatin inhibition.

• Maintenance of "Hard" Look: Like other non-aromatizing compounds, it is investigated for its ability to produce muscle density without water retention.

Technical Specifications

• Chemical Name: Methyl (17α,20E)-17,20-[(1-methoxyethylidene)bis(oxy)]-3-oxo-19-norpregna-4,20-diene-21-carboxylate

• Concentration: 12mg/mL (360mg total per 30mL bottle).

• Format: Liquid solution (Research Grade).

• Storage: Store at room temperature (15-30°C). Protect from direct light. YK-11 is sensitive to temperature fluctuations; ensure the bottle is stored in a stable environment.