[Nipply Russel]

EDIT: dumb question: does the capsule have powder inside when you split it? How to make 2 equal parts? (if is a 500 mg capsule)

You kinda have to peel away the "top" of the capsule (the shorter of the two pieces that make up the capsule). The two parts are bonded together. Once you do that, you'll find that most of the power is in the remaining (large) section. You can pour out the powder and divide it in half with a blade, cocaine-style.