Rasayana

In early ayurvedic medicine, rasāyana is one of the eight areas of medicine in Sanskrit literature.

The 11th-century Persian scholar Abū Rayhān Bīrūnī noted an Indian science named Rasāyana, focused on restoring health and rejuvenation through plant-derived medicines. Nagarjunacharya conducted experiments in his laboratory called "Rasashala" and authored Rasaratanakaram, detailing alchemical transformations of metals. Al-Bīrūnī conflated the earlier rasāyana practices with rasashastra alchemy.

Rasashastra utilized alchemical processes involving substances like mercury and cinnabar. This practice extended beyond metals, incorporating the preparation of medical tinctures from plants. Rasashastra's goals included longevity, health, cognitive enhancement, virility, and extraordinary abilities. Its historical influence was evident in the Ajanta and Ellora cave paintings, the Vishnustambha monument, and the Kondivade caves' processed wood sample.

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