The medicinal plants and herbs are used for many years. Medicinal plants have several secondary metabolites which are helpful for curing of diseases. Some of the herbs are used as growth production, higher FCR, intake, immuno-stimulant, liver tonic, anti-oxidants and for reducing cholesterol. Now-a-days, utilization of these medicinal plants is increasing in another field such as feed additives. If we talk about humans there are several herbal additives for improvement of human digestive system. Herbal additives are also beneficial for animal production example Leaves of Azadirachta indica...