As vitamin B12 is only present in animal products it is usually low in vegans and some vegetarians. Some vegetable sources contain vitamin B12 but it cannot be used by the body, such as yeast, mushrooms and soya products.
Sources
Dairy products
Eggs
Fish
Fortified cereals
Herring
Kelp
Mackerel
Meat
Milk and milk products
Miso
Mushrooms
Oysters
Seaweed
Soya products (if fermented)
Tempeh
Trout
Yoghurt