The Alchemical Body excavates and centers within its Indian context the lost tradition of the medieval Siddhas. Working from previously unexplored alchemical sources, David Gordon White demonstrates for the first time that the medieval disciplines of Hindu alchemy and hatha yoga were practiced by one and the same people, and that they can be understood only when viewed together. White opens the way to a new and more comprehensive understanding of medieval Indian mysticism, within the broader context of south Asian Hinduism, Buddhism, Jainism, and Islam.