Which mercury compound was processed and considered appropriate for rejuvenation?

In Ayurveda, Rasashastra (the science of alchemy and metal-based medicine) mentions the processing of mercury—called Parada—into safe and therapeutic forms. Among these, Rasasindura, a compound of mercury and sulfur, was highly valued and considered appropriate for rejuvenation (Rasayana).

Mercury in its raw form is toxic, but ancient Ayurvedic scholars like Nagarjuna developed purification and processing methods (Shodhana and Marana) to transform it into bioavailable, non-toxic compounds. Rasasindura was believed to rejuvenate the body, improve vitality, enhance immunity, and delay aging.

These preparations were used in minute doses, combined with herbal ingredients, under strict supervision. The goal was not only physical healing but also mental clarity and spiritual balance.

While traditional texts praise these formulations, modern medicine cautions against their use due to potential mercury toxicity if not properly prepared. Still, the Rasasindura process reflects Ayurveda’s advanced understanding of metallurgy and detoxification thousands of years ago, where metals were transformed into therapeutic forms through precise alchemical techniques.