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The Food and Drug Administration is being accused of ignoring calls to pull dietary supplements containing an unapproved ingredient from shelves.

Sen. Claire McCaskill, D-Mo., accused the agency of ignoring her requests to pull any supplements with picamilon, a synthetic drug made by the Soviets to combat a slew of ailments from depression to migraines. The criticism comes in the midst of growing questions about how supplements are regulated.

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McCaskill took matters into her own hands Monday by writing 10 retailers, including Amazon, CVS and Walmart, asking them to voluntarily pull the product.

"So we're at a point of relying on businesses to voluntarily take responsible steps to ensure public safety," she said. "It's embarrassing that it's come to this."

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