I use less than once a year now but when I do I get from the same guy who I've known for a decade now he's always sold large quantities of crystal that is incredibly clear and shaped in variations and sizes of rectangular crystals that provide such a LONG 24+ hour clean smooth ride, mindful and present while hyper focused and definitely up with a long drawn out ride back to baseline. I feel like if you make sure you can actually look at the crystal and I do mean CRYSTALS and you can see through them like glass, no loose powdered portions, if the glass looks like the cook took pride in his work then you shouldn't have anything to worry about. Basically do not consume anything other than what you see on Google when you Google search methamphetamine crystals