YK is a fairly "new" SARM to the world of bodybuilding. SO I don't believe you will find many user reports on it. I've heard it is very potent as far as SARMS go, though, from a reliable source. Not sure about side effects.
Never used yk11 but based on what hear and read i don't think it's stronger than S23 to might be 2nd strongest..Running s23 right now and shiyt is powerful....Biggest thing i am noticing is hella pumps and muscle endurance is through the roof..
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