CCA Industries, MetaboLife and Mason Vitamins claim their supplements can help fight weight gain. But while green tea has been shown to speed metabolism, its effects on weight don't yet pan out. Like all industries, the herbal weight-loss business moves in cycles. Less than a decade ago, the stimulant herb ephedra was one of the stars of the scene. It sped up metabolism and weight loss, but it also raised the heart rate and, in some cases, caused strokes and heart attacks. (Source: L.A. Times - Health)
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