Most people in India follow a vegetarian diet, which does not provide them with Vitamin B 12. This nutrient is essential for healthy nerve tissue, brain function, and red blood cell production. But Vitamin B12 is mostly found in animal-based food products like meat, chicken, eggs, fish and shellfish. Some amount of Vitamin B12 is also found in dairy products and fortified foods. RDI for vitamin B12 is 2.4 mcg.