Vitamin B2, also known as riboflavin, is a water-soluble vitamin that plays a crucial role in energy production and the metabolism of fats, drugs, and steroids. It helps convert carbohydrates into glucose, which the body uses for energy. Additionally, riboflavin is essential for maintaining healthy skin, eyes, and nerve functions. This vitamin is found in various foods, including dairy products, eggs, green leafy vegetables, and whole grains. A deficiency in vitamin B2 can lead to symptoms such as sore throat, redness and swelling of the lining of the mouth and throat, and cracks on the outsides of the lips, known as cheilosis.