SARMs

YK-11

Also known as: YK11 · Myostatin inhibitor SARM

The SARM that inhibits myostatin — unlocking your genetic muscle ceiling.

Half-Life
~6–10 hours (split dosing recommended)
Administration
Oral
Category
SARMs
Citations
1 studies

What is YK-11?

YK-11 is a steroidal SARM that is unique in that it also inhibits myostatin — the protein that limits muscle growth. By simultaneously activating androgen receptors AND inhibiting myostatin, YK-11 theoretically allows muscle growth beyond your genetic ceiling. It is one of the most potent and least studied SARMs.

Mechanism of Action

YK-11 is a partial agonist of androgen receptors with a steroidal backbone. It uniquely induces follistatin production in muscle cells, which inhibits myostatin (GDF-8). Myostatin is the body's natural muscle growth limiter — removing it allows for supraphysiological muscle hypertrophy.

YK-11 Dosing Protocol

5–15 mg/day oral, split into 2 doses. Start at 5 mg/day to assess tolerance. Cycle: 6–8 weeks maximum (limited safety data). PCT is required.

Administration Routes
Oral
Half-Life
~6–10 hours (split dosing recommended)

Want a personalized protocol? Tell PepBot your goals, health status, and experience level for a custom YK-11 protocol.

YK-11 Benefits

Myostatin inhibition (beyond genetic muscle ceiling)
Powerful anabolic effects
Significant strength gains
Bone density improvement
Potential for muscle growth exceeding natural limits

Side Effect Profile

Significant testosterone suppression, potential liver toxicity (steroidal structure), joint pain reported by some users. Limited human safety data — use with caution. PCT required.

YK-11 Stacking Guide

YK-11 works synergistically with these compounds. Click any to learn more, or ask PepBot to build you a complete stack.

Research & Citations

1
YK-11 induces myogenic differentiation and inhibits myostatin in C2C12 cells
Biological and Pharmaceutical Bulletin · 2013

Frequently Asked Questions about YK-11

Does YK-11 really break through genetic muscle limits?
In theory, yes — by inhibiting myostatin, YK-11 removes the primary biological brake on muscle growth. In practice, the effect in humans is less dramatic than animal studies suggest. Users report exceptional strength and muscle gains, but 'breaking genetic limits' is an overstatement for most people. It's still one of the most powerful compounds available.

Still have questions about YK-11?

PepBot has encyclopedic knowledge of YK-11 — dosing, stacking, interactions, latest research, and personalized protocols. Ask anything.

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