When Do You Need a Vitamin or Mineral Supplement?
Supplements are not substitutes. They can't replace the variety of necessary nutrients found in whole foods, but you might need them:
If you frequently skip meals or don't eat enough fruits, vegetables, grain and dairy products.
If you're on a low-calorie diet.
If you're a strict vegetarian.
If you can't drink milk or eat yogurt.
If you're a woman of child-bearing age and don't eat fruits and vegetables.
If you are pregnant.