Vitamin B12 is found naturally in a wide variety of animal foods and is added to some fortified foods.
As the NIH points out, plant foods have no vitamin B12 unless they are fortified.
As a result, people strictly adhering to a vegan or vegetarian diet are at a higher risk of B12 deficiency.
However, you can find alternative sources of B12, such as yeast extract (including Marmite), as well as some fortified breakfast cereals and soy products.
Source: | Daily Express