Chapter 1. Nanotechnology based bacterial immunotherapy.- Chapter 2. Immunomodulatory properties of nutraceuticals and functional foods.- Chapter 3. Immunoregulatory bioactive phytoconstituents- recent trends and future challenges.- Chapter 4. Plant derived immunomodulators and immune system.- Chapter 5. Polyphenols and its effect on immune system.- Chapter 6. Mineral nutraceuticals and immunity enhancement.- Chapter 7. Nutraceuticals as disease preventive food and immunity boosters.- Chapter 8. Current and Future prospects of flavonoids for human Immune system.- Chapter 9. Resveratrol and immunomodulation.- Chapter 10. Immunomodulation impact of curcumin and its derivative as a natural ingredient.- Chapter 11. Colchicine and andrographolide as natural immunomodulators.- Chapter 12. Immune booster property of epigallocatechin-3-gallate and catechin.- Chapter 13. Recent advances of nutraceutical and functional foods in immune health.- Chapter 14.Therapeutic effects of Withania somnifera-an overview with special focus on Alzheimer's disease and infertility among youth.