A hair smoothing solution known as Brazilian Blowout contains unacceptable levels of formaldehyde and should be avoided, says Health Canada.

Testing by the public health agency found that the product contains 12 per cent formaldehyde. When used in cosmetics as a preservative no more than 0.2 per cent is allowed.

Formaldehyde is a known irritant, sensitizer and can cause cancer if inhaled over a long period of time.

Health Canada has received complaints about burning eyes, nose and throat along with breathing difficulties associated with the product.

There has also been one report of a person losing their hair.

Brazilian Blowout is used by hair stylists in salons across Canada.

The agency advises any consumers who have reactions to the treatment to seek medical attention. It warns stylists to stop using it immediately.