The valuable substance in the Dune universe is called "spice" or "spice melange." It is a rare and precious drug found only on the desert planet Arrakis (Dune). The spice extends life, enhances mental abilities, grants prescience (the ability to see into the future), and is essential for enabling safe interstellar travel through space folding by the Spacing Guild. Its scarcity, powerful effects, and central role in the universe's economy make it the most important and coveted commodity in the Dune universe. The spice is also highly addictive and has a distinctive cinnamon-like smell. Control over the spice means control over the universe.
