Rasayana essentially means nutrition at all levels from macro to micro-cellular level. Rasayana therapy replenishes the vital fluids of the body; boost the ojas (vital force of life) and the immune system, thus keeping away from diseases and prevents against ill effects of advanced age. Rasayana   brings about the normalcy of Rasadhatu and thereby maintain other dhatus(body tissues) in equilibrium for a longer period. Such state of improved nutrition prevents ageing which can be understood as vayasthapana or jaranasana (geriatric care).

Rejuvenation therapy prevents effect of ageing and provides longevity, improves mental and intellectual competence, preservation of youthfulness, increased luster, body complexion and glow of the skin, healthy condition of voice, excellent potentiality of the body and the sense-organs,. The Rasayana drugs are mainly classified as Kamya Rasayana (for promotion of health of individuals) and Naimittika Rasayana( for cure of diseases). The commonly used Rasayana drugs are Amalaki (Phyllanthus emblica), Aswagandha (withania somnifera), Brahmi (Bacopa monnieri), Shankhapushpi (Convolvulus pluricaulis), Guduchi (Tinospora cordifolia) and Yastimadhu (Glycyrrhiza glabra) etc.,  which promote physical and mental strength.