It's not. Msm is a very common adulterant, or at least it used to be. They meth-head up the street cuts your shit with it because it's cheap, widely available and makes a crytal that looks similar to meth. It tastes shitty and melts at a water lower temperature. It also dissolves in acetone well. Due to these facts, it has fallen out of the #1 position as a meth adulterant. There are other things that are a lot harder to detect, but the low iq meth heads still use it to rip you off. The guy 2 people above him is using menthol or N-isopropyl benzylamine