A critical appraisal on Parpati Yoga in the context of Rasayogasagara

Parpati Yoga is a unique thin flake like preparation consisting of Parada (mercury), Gandhaka (Sulphur), other metals, minerals and herbal drugs. The therapeutic significance of Parpati Yoga is very high owing to its minimal dose, no unwanted taste and cost effectiveness. The unique preparatory procedures mentioned in Ayurvedic classics for Parpati Yoga is stated as per the indications. Rasayogasagara (19th century) is one of the authoritative books for Parpati yoga.  The present paper aims to compile all the available references of Parpati Yoga and to intricate the composition, different method of preparations, dose, indications and contribution of various texts regarding Parpati Yoga. All the references related to Parpati Yoga cited in Rasayogasagara additionally in other Rasa texts such as Rasa Ratna Samuchchya, Bhaishajya Ratnavali, Siddha Yoga Samgraha and Bharat Bhaishjya Ratnavali were screened by its ingredients, preparatory methods and indications. Maximum number of Parpati Yoga (Total 58) are found in Rasayogasagara and indicated for Grahani and other disorders too. This review makes clear idea about Parpati Yoga with its method of preparations