NBC NATIONAL NEWS — The manufacturer of popular Brazilian Blowout products will now have to warn stylists and users some of the products release formaldehyde gas, which could cause cancer.

The company had advertised it products as "formaldehyde free," but according to a study referenced in a lawsuit by the State of California, the products actually release a significant amount of the gas.

The warnings will remind users to take precaution when using brazilian blowout products. The manufacturer says the warning labels have been in place for months.