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Vitamin B2, or riboflavin, occurs naturally in foods, is added to foods, and is available as a supplement. Bacteria in the gut can produce small amounts of riboflavin, but not enough to meet nutritional needs. Riboflavin is a key component of coenzymes involved in cell growth, energy production, and the breakdown of fats, steroids, and drugs. Most riboflavin is used immediately and is not stored in the body, so excess amounts are excreted in the urine. Excess dietary riboflavin, usually from supplements, can cause urine to turn bright yellow.