How do you use SPICE?

In Dune, there is only one source of melange: the sands of the planet Arrakis, colloquially known as Dune. Melange is a geriatric drug that gives the user a longer lifespan, greater vitality, and heightened awareness; it can also unlock prescience in some subjects, depending upon the dosage and the consumer's physiology. It is also known in casual conversation as spice.