In a stepped-up federal campaign to stop makers and marketers of dietary supplements from making false or baseless health claims, U.S. marshals seized about $2.6 million worth of Coral Calcium Supreme, a supplement its makers claim treats or prevents major diseases. The Federal Trade Commission also has warned some 18 firms that operate Web sites selling coral calcium, part of an $877 million calcium supplement market, to stop making unsubstantiated health claims.

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