The ongoing controversy over...Brazilian Blowout and similar keratin hair smoothing treatments...intensified this week, when U.S. health officials issued a hazard alert warning about dangerous formaldehyde levels found in some of the products...State OSHA offices in California and Oregon began investigating the...hair smoothing products several months ago after a host of complaints from salon workers and clients reporting headaches, nosebleeds, blisters, burning eyes, vomiting, asthma attacks and other respiratory problems...The company’s chief executive, Mike Brady, takes issue with the findings and questions the government agencies’ testing methods. In December, GIB LLC sued Oregon OSHA over its testing, although the suit was later dropped. Brazilian Blowout solutions have “never emitted any unacceptable levels of anything that I’m aware of per OSHA testing,” Brady said in a phone interview Wednesday.