Foods that can be supplemented with vitamin B2: 1. Cereals, such as rice, millet, oats, buckwheat, the bran and germ of these cereals are rich in vitamin B2. 2. Green leafy vegetables, such as spinach, oleander, lettuce, these green leafy vegetables are rich in vitamin B2. 3. Animal offal, such as pig liver, chicken liver, duck liver, goat liver, these animal livers are rich in vitamin B2. 4. 4. dairy foods, such as milk, goat’s milk and horse’s milk.