Thiamine (B1), Riboflavin (B2), Niacin (B3)
Vitamins B1, B2 and B3, also known as thiamine, riboflavin and niacin, are in a group of B vitamins that help to convert carbs into sugar to fuel your body. These vitamins keep your skin, hair, eyes and liver healthy, your immune system strong and your circulation system running. You can get these vitamins in meats, grains and vegetables. Most people don't develop deficiencies in these vitamins because so many grains are enriched with them, says Sukol. But if your diet is made up of mostly white foods, it may help to eat better or take supplements.