Riboflavin, also known as vitamin B2, is an essential nutrient for human health, playing a key role in energy production and the metabolism of fats, drugs, and steroids. It is a water-soluble vitamin that is not stored in the body, so it needs to be replenished regularly through dietary sources. Riboflavin is naturally found in foods such as dairy products, eggs, green leafy vegetables, and lean meats. As a food additive, riboflavin is commonly produced through fermentation with genetically modified bacteria. This synthetic riboflavin is commonly used to fortify various foods to enhance their nutritional value.