When buying broccoli, choose those with deep green color, and stalks and stems that are firm. Store dry in an open plastic bag in the refrigerator up to about four days. A centrifugal juicer can extract only very little juice out of broccoli but a gear juicer does the job perfectly. You can mix broccoli juice with carrot and green apple juice to make it palatable. Drinking broccoli juice raw is best to obtain the most nutrition out of it.