Most supplements on the market haven't caused problems, but there is less oversight of supplements sold in the United States than of prescription drugs. In their joint statement, the American Dietetic Association and the American College of Sports Medicine noted some cases of protein supplements also containing anabolic steroids. One 2010 experiment by Consumer Reports tested 15 protein drinks purchased online or from stores in the New York metro area. The study found three products that would exceed the daily limit of arsenic, cadmium and mercury set by the . Pharmacopeial Convention if a person consumed more than the three recommended servings.
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