Vitamin B ₂: Riboflavin

Riboflavin (vitamin B ₂) is not synthesized by vertebrates and must be supplied by diet. It is found in most foods, with the highest content in dairy products, meat, and dark green vegetables. Deficiency rarely occurs alone where adequate food is available and usually occurs as a multinutrient deficiency. Some conditions and medications can decrease effectiveness or levels of riboflavin. Supplementation is rarely needed to prevent ariboflavinosis when a normal diet is consumed. Supplementation for decreased frequency of migraine headaches and prevention of age related cataracts could be beneficial. There is no known toxicity.