The immune system is one of our most complex biological systems in the body. Immunization may be active or passive. The active immunization involves stimulation with an antigen to develop immunological defences against a future exposure and passive immunization involves administration of preformed antibodies to an individual who is already exposed to be exposed to an antigen. Immunomodulatory agents originate from both plant and animal which increases the immune responsiveness of the body against pathogens by activating the non specific immune system. The immune system dysfunction is responsible for various diseases like allergy, asthma, arthritis, cancer and other infectious diseases. So modulation of immune responses too much required to controlling the various infectious diseases. The texts of traditional Indian medicine literature consist of a number of plants reputed to promote physical and mental health, improve defence mechanisms of the body and enhance longevity, lesser number of side effects against synthetic immunomodulatory agent.
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