People may get very sick when their food does not have enough riboflavin. Adding extra riboflavin help. Baby foods, breakfast cereals, pasta, sauces, fruit drinks, and foods such as cheese that are made from milk may have extra riboflavin added. This is called fortification. To make Vitamin B2 for vitamin pills or to add to foods, industrial companies grow special yeasts, other fungi, or bacteria that make a lot of riboflavin.