U.S. health authorities are ordering a Las Vegas company to pull its herbal supplements off the market because some of its products tested positive for salmonella, part of a nationwide outbreak linked to the ingredient kratom.

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Many people make a new year's resolution to drop some pounds - and a new consumer reports survey says about a quarter of them will use weight-loss supplements. But do they work?

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In the largest study of its kind, researchers in Britain have found not enough vitamin D could increase the risk of Alzheimer's disease.

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Herbalife is facing an inquiry from the Federal Trade Commission. The nutrition and supplement maker said Wednesday that it received the civil investigative demand from the FTC on Wednesday.