"Unless you are a vegetarian, which may mean you're at risk for being vitamin-B12 deficient, or have had intestinal surgery like gastric bypass, which makes it more difficult for your body to absorb certain vitamins and minerals, you don't need to take a daily multivitamin," Dr. Nesheiwat said. "Most people get enough vitamins and minerals by eating a well-balanced diet with sufficient amounts of fruit, vegetables, proteins, fats, and carbs."