Vitamin B2 is a water-soluble vitamin, like all other B vitamins, which means it is flushed out of the body on a daily basis, thus it must be replenished on a daily basis to avoid shortages. It is critical since it is required for the normal functioning of every cell in the body. The best source of vitamin B2 is dietary meat products such as beef, pork, and lamb. Other high-quality sources include fish, poultry, dairy products, eggs, soy products, wheat products, and yeast extracts. The body uses vitamin B2 for many functions including forming blood vessels, muscles, and nerves; producing antibodies; metabolizing fats and carbohydrates; and preventing nerve damage. Vitamin B2 is also necessary for the formation of DNA molecules and for keeping teeth healthy. Humans are not capable of making vitamin B2 so it must be obtained through food or supplements. When your body no longer needs something, it gets rid of it. This includes getting rid of vitamin B2. Your body does this by either breaking down its container (liver) or by dumping it into the urine or feces. Either way, you're losing vitamin B2 each time you flush it down the toilet. To prevent this from happening, you need to supplement your diet with vitamin B2 on a regular basis. The amount of vitamin B2 you need varies depending on your age, gender, physical activity level, and what kind of diet you eat.