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You buy vitamins and other nutritional supplements with the goal of improving your health, but do you know exactly what to look for, or what's inside the bottle? Just because a supplement is labeled "all-natural" doesn't mean it's safe -- or effective.

Before you buy any supplement, read through this list of frequently asked questions to make sure you're buying a product that helps rather than harms your health.

What is a dietary supplement?

Dietary supplements include vitamins, minerals, herbs, botanicals, enzymes, amino acids, or other dietary ingredients. You take these products by mouth in pill, capsule, tablet, or liquid form to supplement your diet.

Can I take supplements on my own, without a doctor?

Supplements are available for sale over the counter at your local pharmacy or online without a prescription. Still, you should always check with your doctor before taking any product, because some supplements can cause side effects, or interact with other prescribed or over-the-counter medicines or supplements you're already taking. It's especially important to ask your doctor about taking a supplement if you're pregnant or nursing, about to have surgery, or you have a health condition such as high blood pressure, heart disease, or diabetes. Also, use caution if giving a supplement to a child.

What questions should I ask my doctor about taking supplements?

Ask your doctor whether you need the supplement based on your current diet and health. Also ask what benefits and risks the supplement can have, how much to take, and for how long you should take it. Make sure your doctor and pharmacist know exactly which supplements and medicines you're taking.

Are all supplements tested to make sure they're safe and effective?

No. Manufacturers aren't required to test their products for safety and effectiveness. Some supplement ingredients have been tested in animal or human studies. For example, folic acid has been shown in studies to reduce the risk of birth defects in pregnant women. However, other supplement ingredients haven't been studied well, or at all.

The U.S. Food and Drug Administration (FDA) does regulate dietary supplements; however, it treats them like foods rather than medications. Unlike drug manufacturers, the makers of supplements don’t have to show their products are safe or effective before selling them on the market.

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