Hello,
Welcome to health care Magic
Foods rich in B12 are non vegetarian sources like meat, poultry, sea food, egg etc. You are a vegetarian. Milk, yoghurt, cheese and cereal fortified with B12 can be taken. Vitamin B12 capsules are available. You may take daily dose of 500 microgram ( C. Meconerv)for 2 months. Side effects or oral Vitamin B12 are minimum. Gastritis is rarely seen.
Hope this helped
Take care

Hi,Pallavi, Vitamin B-12, or Cobalamin, is the largest and most complex vitamin.A slight deficiency of vitamin B-12 can lead to anemia, fatigue, mania, and depression, while a long term deficiency can cause permanent damage to the brain and central nervous system. Vitamin B12 can only be manufactured by bacteria and can only be found naturally in animal products, however, synthetic forms are widely available and added to many foods like cereals. Vitamin B12 can be consumed in large doses because excess is excreted by the body or stored in the liver for use when supplies are scarce. Stores of B12 can last for up to a year. You can take cheese , soya milk, whole milk, yogurt, fortified cereals.. If you can take egg, eat the egg. Or you can take vitamin B 12 tablet once a day, if you have more deficiency with some complaints, then take B 12 injection, IM twice a week. There is least side effect of exess... As it is excreted in urine. .. Ok