Jara Chikitsa – Rasayana – (Gerentorology or Science of Rejuvenation)
This branch of ayurveda deals with the promotion of longitivity and maintaining the health of the people. With the aid of rasayana we can increase the ojo (life force) of the body and also increase the immune system of an individual. In a lay man term rasayana can be said as the procedure or a substance by which aging process is retarded.
This method of beating our age has been time tested and was very much in practice in ancient India. Rishi by practicing therapy was able to attain youth for very long time. When taken as the literal meaning of the term rasayana, it means enhancing the effect of rasa (a vital fluid responsible for creating energy in our body.). You can yourself think of the importance of rasayana as it is mentioned in first chapter of chikitsa sthana of charak samhita. There are several rasayana mentioned in ayurveda. Major one are: amlaki (Indian goose berry), shilajit, ashwagandha, bhringraj, triphala etc.