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Shares of GNC Holdings (GNC -5.6%) and Vitamin Shoppe (VSI -3.3%) slide after the FDA cracks...
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Monday, April 30, 2012, 10:37 AM ETShares of GNC Holdings (GNC -5.6%) and Vitamin Shoppe (VSI -3.3%) slide after the FDA cracks down on companies offering supplements containing the stimulant DMAA. The agency claims the ingredient increases the risk of higher blood pressure and could lead to possible cardiovascular events if overused.
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