Vitamin and Mineral FAQ

You need omega-3 fatty acids but you don't like, or won't eat fish. This fatty acid is also found in plants, but if you prefer, you can take omega-3 supplements instead of eating fish.

You should be able to get all the vitamins and minerals you need from the foods you eat, but there are some reasons you may want to take dietary supplements.

Selenium is a trace mineral that works as an antioxidant. It's generally safe to take as a dietary supplement, but there are possible side effects that can occur if you take too much selenium.

Hoodia is a dietary supplement that may aid in weight loss. Find out how much it helps and if it's worth the expense.

A few dietary supplements, like iron, should be taken on an empty stomach, but most can be taken with food if you prefer. In fact, some vitamins should be taken with food. Learn more.

Learn more about antioxidants and how they protect the cells in your body from damage due to free-radicals. You'll find antioxidants in many of the foods you eat, or you can take them as dietary supplements.

A look at the two forms of vitamin K: menaquinone and phylloquinone. Find out what type is used in dietary supplements and which form is in the food you eat.

Vitamin D really refers to four different compounds, and they all contribute to bone health. Here's a look at the four forms of vitamin D: cholecalciferol, ergocalciferol, calcidiol and calcitriol.

Niacin is a B-complex vitamin and can be taken in large doses to treat elevated cholesterol levels. But it causes a very irritating (and sometimes scary) side effect called the niacin flush.

Cholecalciferol (D3) and ergocalciferol (D2) are two natural forms of vitamin D and both can be used in dietary supplements. Learn more about the two forms and find out if it matters which one you take.

B-complex vitamins are needed for energy metabolism, but taking extra B vitamins won't give you any additional energy. Learn more.