If you are studying about our body structure and body function it is very complex to understand, like liver is doing 400 different functions, Kidney have different various functions. We need a proper diet and vitamin for all of these body functions work properly. Vitamin B12 is a very important part to make our body more healthy through red blood cells quantity to maintain in the bone marrow. B12 is available in animal food and dairy products, sometimes it is very difficult to vegetarian people. What symptoms define the deficiency of Vitamin B12 are: weakness and fatigue, increase your heartbeat rapidly, rapidly breath, Weight Loss, Yellowish tinge to skin and eyes. If you are facing these type of problem immediate you check Vitamin B12 in your body. Health Researchers say Vitamin B12 is like a powerhouse which help to make DNA, nerve as well as blood cells for healthy brain and immune system of the body. Vitamin B12 is occurs naturally in animal foods like meat, eggs etc.