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YK-11 is a synthetic selective androgen receptor modulator (SARM) that is often categorized as a myostatin inhibitor. It was initially developed to help treat conditions such as muscle wasting and osteoporosis.
YK-11 works by binding to androgen receptors in the body, specifically in muscle cells. This binding activates the androgen receptor, which then stimulates the production of follistatin. Follistatin is a protein that inhibits myostatin, a naturally occurring protein that limits muscle growth. By inhibiting myostatin, YK-11 allows for increased muscle growth and development.
Additionally, YK-11 also activates the production of proteins associated with muscle growth, such as insulin-like growth factor 1 (IGF-1). This further contributes to the overall muscle-building effects of YK-11.
It is important to note that YK-11 is still under research and its long-term effects and safety profile are not fully understood. It is not approved for human use and is primarily used in scientific studies and by athletes and bodybuilders for its potential muscle-building properties.