Should Herbalife Investors Be Worried Now?

A U.S. senator asks regulators to investigate whether Herbalife is a pyramid scheme and the shares tumbled. 

It was only last week that shares of dietary-supplement distributor Herbalife Ltd. took a beating after Chinese regulators announced they were going to investigate Nu Skin Enterprises Inc., which has a similar business model. Now the multilevel marketer has an even bigger problem: U.S. politicians.

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