This document is a presentation on Rasashastra, focusing on the therapeutic uses of various herbomineral medicines (Rasa aushadhi) in Ayurveda, including mercury and specific formulations. It serves as an introduction to important concepts for Ayurvedic students and outlines the properties, benefits, and applications of different Rasas such as Maharasa and Sadharan Ras. Additionally, it addresses common misunderstandings about the safety of using metals in Ayurveda when prepared correctly.