Makers of dietary supplements are at it again, putting a new chemical stimulant – untested on humans — into workout, weight-loss and brain-function products sold widely through retailers including ...

A new stimulant drug that has never been tested in people can be found in 12 weight loss and sports supplements, some of which are sold in mainstream vitamin shops, according to a new study. The ...

In a move designed to halt sales of popular workout stimulants, the U.S. Food and Drug Administration (FDA) recently issued warning letters to some 14 dietary supplement companies. At issue is an ...

Nutritional supplement retailer GNC has stopped selling two products containing a new stimulant ingredient that is under fire from scientists, senators and a major industry group. The products Redline ...

A new warning is out from researchers about a hidden and potentially dangerous stimulant. The study, published in the peer-reviewed journal Drug Testing and Analysis Thursday, concluded 12 out of 14 ...

The FDA has sent warning letters to companies selling dietary supplements containing two ingredients that scientists say are synthetic stimulants not approved for human consumption. The agency in ...

A week after warning five dietary supplement companies that their products contained BMPEA, an unapproved and poorly-studied amphetamine relative, the FDA is acting on other sports and nutrition ...