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YK11 is a non-steroid drug with steroid-like effects, used for building muscle mass quicker without the adverse effects other drugs cause. It’s not exactly a SARM, but it works in a very similar way, which is why it’s often lumped in the SARM group. It actually works to improve your performance by being a myostatin inhibitor. Myostatin, also called GDF-8, is a protein that downregulates muscle size, preventing them from growing too large. By inhibiting myostatin, YK11 works to increase your gains in muscle size quickly.
Dihydrotestosterone, or DHT, is a testosterone byproduct that plays a role in men’s sexual function and in their progression through puberty. Given that YK11 has a chemical structure similar to DHT and that it binds to androgen receptors in a similar way, YK11 may also exhibit the same benefits in men as DHT. This includes improving prostate health, fighting hair loss and enhancing sexual function.
In a study published in “Biological & Pharmaceutical Bulletin,” researchers found that YK11 amplifies muscle mass growth by increasing follistatin levels. Follistatin is a protein your body synthesizes on its own, and it’s responsible for keeping your myostatin levels in check. Higher follistatin levels cause myostatin levels to be lower, since follistatin is a myostatin inhibitor .