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SARM YK11 was first studied by Yuchiro Kanno in 2011. Not only for muscle gains, YK11 also aided in body hair growth but with no effect on the prostate. YK-11 essentially induces muscles cells which causes said cells to make more follistatin. So, YK-11 can be considered a myostatin inhibitor. This is key as myostatins are considered limiters of muscle growth and gains.