Vitamin B12 is naturally found in animal products, including fish, meat, poultry, eggs, milk, and milk products. Vitamin B12 is generally not present in plant foods, but fortified breakfast cereals are a readily available source of vitamin B12 with high bioavailability for vegetarians. A diet lacking quality animal proteins and products (including red meat, poultry, seafood and dairy) or B12 fortified foods may contribute to reduced B12 intake from dietary sources. Individuals who follow a vegan or vegetarian style diet may choose to include an additional source of B12 daily.