In the United States, the government does not test supplements; the law leaves it up to the manufacturers to be accurate and truthful.

ConsumerLab.com narrates its contractors' testing methods and quality criteria/standards used to test supplements.

One place to start is ConsumerLab.com, an independent research organization that tests supplements.

The company does not test supplements which are known to be hazardous, like comfrey.

NSF, which began its program in July, is hired by manufacturers to test supplements provided by the company.

These trials tested dietary supplements such as prickly pear, borage, yeast, and artichoke.

Though we're testing anti-aging drugs and supplements in my lab every day, they are not likely to benefit me much.

The study was conducted by ConsumerLab.com, a company that tests dietary supplements.

In the United States, 23,000 male physicians are testing supplements of beta-carotene either alone or with aspirin to see if the incidence of cancer and heart disease can be lowered.

But when researchers tested antioxidant supplements, they unexpectedly found an increased risk of lung cancer among smokers who took beta-carotene supplements.