Although garlic kills viruses, bacteria and other microorganisms directly, it also excites the body’s natural defenses against these antigens. Garlic’s amazing and famous power against diseases is due to a combination of both these properties. Aged garlic extracts have an immunomodulatory effect and lessens the age-related deterioration of the immune response. Garlic supplementation in chickens increase the relative weights of the spleen, bursa of Fabricius and thymus