WASHINGTON – Despite ongoing safety concerns from parents, consumer groups and politicians, a chemical used in baby bottles, canned food and other items is not dangerous, federal regulators said Friday.

Food and Drug Administration scientists said the trace amounts of bisphenol A that leach out of food containers are not a threat to infants or adults. The agency acknowledged that more research is needed to fully understand the chemical's effects on humans, and noted "there are always uncertainties associated with safety decisions."

The FDA previously declared the chemical safe, but agreed to revisit that opinion after a report by the federal National Toxicology Program said there was "some concern" about its risks to infants.

The plastic-hardening chemical, similar to the hormone estrogen, is used to seal canned food and make shatterproof bottles. It is also used in hundreds of household items, ranging from sunglasses to CDs.

The FDA's draft report was greeted with enthusiasm by the American Chemistry Council, which has defended the chemical's safety.