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Immunity boosters

Companies can use words like immunity blend or supports the immune system if a product contains certain vitamins, but such words are sometimes used to give an aura of health to a product that may or may not deserve it.

In general, companies must walk a fine line here. If they make medical claims, it can trigger intense scrutiny from the FDA and the federal trade commission.

In 2008, the company that makes the vitamin product Airborne agreed to settle a $23.3 million class-action lawsuit. The product's label said it could "boost the immune system" and was marketed as a way to prevent colds without sufficient evidence that it worked.

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