Abstract: 
The immune System is the most complex biological systems in the body. At the time of infection related to viruses, bacteria and fungi only the immune system is able to detect the pathogen by using a specific receptor to produce immediate response by the activation of immune components such as cytokines, chemokines and release of inflammatory mediators to modulate and potentiate the immune system. Modulation of immune response, as a possible prophylactic or therapeutic measure, by using various medicinal plant products has become a subject of scientific investigation. According to Ayurveda, most of the commonly used active ingredients i.e. plant derived materials (alkaloids, glycosides, proteins, lectins, polysaccharides, etc.) are extracted from Indian medicinal plants for the treatment of various ailments and have so many advantages over the conventionally used drugs, which are so expensive and known to have harmful side effects.

Keywords: Cytokines, Pathogen, Ayurveda, Medicinal Plant.