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Possible lawsuit over Kardashians, QuickTrim

Left: Kim Kardashian celebrated her 31st birthday at Marquee Nightclub inside The Cosmopolitan of Las Vegas on October 21, 2011. Right: Khloe Kardashian appears in a promotional image for 'Keeping Up With The Kardashians' in 2011. (Denise Truscello / Wire Image/ E!)

February 22, 2012 12:00:00 AM PST
Kim and Khloe Kardashian could end up in court over a diet pill endorsement. The sisters may soon be subjects in a class action lawsuit.

A case is being prepared against the distributors of QuickTrim and marketing claims made by the Kardashians.

QuickTrim is a weight-loss supplement that's not approved by the Food and Drug Administration.

The Kardashian sisters claimed they used it to lose 15 pounds in weeks.

Opponents say QuickTrim contains high levels of caffeine and ingredients that aren't safe or effective for weight loss.

The Kardashians have not commented on the case.