Rasayana chikitsa Focuses on rejuvenation and anti-aging. The word “rasayana” comes from the Sanskrit words “rasa” meaning “juice” or “essence” and “ayana” meaning “path” or “way”. Together, they refer to the path towards rejuvenation and longevity. Rasayana chikitsa involves a variety of practices designed to promote physical and mental well-being and longevity.