The safety of triclosan, an antibacterial ingredient used in soap and toothpaste, is under review in the U.S.

Triclosan is used to reduce or prevent bacterial contamination.

The U.S. Food and Drug Administration said Thursday it doesn't believe triclosan is harmful to humans, but an animal study suggested it may alter hormone regulation. Lab studies showed it may make bacteria evolve resistance to triclosan in a way that could also lead to resistance to antibiotics.

The agency said the research needs a closer look, and it will release the results of its review in the spring of 2011.

Officials said they haven't found evidence that antibacterial soaps and body washes with tricolosan carry any health benefits.

Consumers can reduce their exposure by using plain soap and water.

Health Canada has recommended that people avoid antibacterial products because they kill healthy bacteria that fight harmful germs and because of concerns over antibacterial products.

"FDA does not have sufficient safety evidence to recommend changing consumer use of products that contain triclosan at this time," the U.S. Environmental Protection Agency said in a statement posted on its website. In March, the EPA said it would accelerate its planned review of triclosan.

The Soap and Detergent Association defends the safety of triclosan.