The main aim of the Ayurvedic Science is to attain Dhatusatmya (equilibrium of tissues) through Samana (pacification therapy) & Sodhana (Purification Therapy).
Nasya is one among the Sodhana procedures which is mainly used to eliminate the morbid doshas that are accumulated above the neck region.
NASA: Nasa is considered as the GATEWAY OF SIRAS. It is made of tarunasthi measuring 2 angula. The drug administered through nose eliminates only the morbid doshas that cause diseases in urdwajatru area.