The word Rasayana is composed of two words Rasa + Ayan. Rasa means “nourishing juice” and Ayan means “pathways or channels”. So term Rasayana means by which one gets the excellence of Rasa (Nourishing juice) is known as Rasayana. Apart from the excellence of Rasa, the individual is endowed with Psychic excellence like mental stability and alertness, by virtue of rejuvenation therapy. Drugs, diet and regimens which promote longevity by delaying aging and preventing diseases are called Rasayana.