It is the rasa flowing in the body which sustains life. Rasayana in Āyurveda is the method of treatment through which the rasa is maintained in the body. This is a specialized branch of clinical medicine meant for preventing the effect of ageing and to improve memory, intelligence complexion, sensory and motor functions. Numerous rasayana medicines are reported for possessing diversified actions like immune-enhancement, free radical scavenging, ant stress and nutritive effect.
Depending upon the requirement and condition of the patient or specific individual the Rasayana therapy is broadly classified into Vatatapika and Kutipraveshika. In Vatatapika patient is not need to be hospitalized and can continue his routine work. In contrary to this, the individual is to be hospitalized to go through the different stages of Rasayana karma in Kutipraveshik Variety. The Achara Rasayana (good code of conduct) gives the desired effect of Rasayana and helps in preventing the psychological disorders.