We were startled to discover today that L'Oreal is under fire (heh), i.e., possibly getting sued, for its Garnier Fructis Sleek & Shine Anti-Frizz Serum -- because the stuff is reportedly flammable.

Women's Wear Daily reports today that the lawsuit against L'Oreal is on: A judge granted class action to four plaintiffs on Thursday who filed the motion for class certification on Feb. 2. The plaintiffs are seeking recognition for any person who purchased the Garnier serum from Feb. 4, 2008, to the present.

According to the lawsuit and Top Class Actions law blog, the Garnier serum’s two main ingredients are cyclopentasiloxane and dimethiconol, chemicals that can ignite at 171 degrees Fahrenheit. (Flat iron temperatures typically range from 300-450 degrees Fahrenheit.)

A copy of the original lawsuit, filed in June 2011, can be found here.

OMG. We've totally used that stuff before, without any bonfire-type incidents. But of course, flammable products are not exactly something you want coming between your hair and a high-heat styling appliance like a blow dryer or flat iron, which most women use on a regular basis.

We've contacted L'Oreal for comment on this lawsuit, and we'll keep you posted on whether the Garnier anti-frizz serum will be yanked from the shelves, but in the meantime, check out some other controversial beauty products below.

UPDATE: L'Oreal tells us, "We cannot comment on the current lawsuit except to say that L’Oréal denies the allegations and will continue to vigorously defend Garnier Fructis Sleek & Shine Anti-Frizz Serum as safe for consumers."

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  • DEREON Cosmetics

    Korean boy band FT Island filed a lawsuit against DEREON for unlawfully using their photos in their merchandise. (Courtesy photo)

  • Avon

    Avon was sued for claiming their products weren't tested on animals, when in fact, they were. (Courtesy photo)

  • Hain Celestial Group

    The Hain Celestial Group, which produces beauty lines like Jason, was sued for claiming their products were organic but in reality, they contained significant non-organic substances. (Courtesy photo)

  • Estee Lauder

    Estee Lauder was sued by model Caroline Louise Forsling for using her face to promote an anti-aging skin-care product, without her knowledge. (Courtesy photo)

  • Mary Kay Inc.

    Mary Kay, like Avon, was sued for claiming there was no animal testing involved with their products, when supposedly the company knew otherwise. (Courtesy photo)

  • LASplash Cosmetics

    Model Yuliana Bondar sued LASplash for using her photo to promote their beauty products, without her consent. (Courtesy photo)

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