The Food and Drug Administration is warning consumers to beware of products that claim to prevent or cure diabetes.

The FDA says "bogus products" that make false claims about their ability to treat diabetes "are flooding the marketplace." These illegal over-the-counter drugs, often sold on the Internet by fraudulent online pharmacies, are typically marketed as "all-natural" supplements that will lower blood sugar. Other red flags are claims that the product "protects your eyes, kidneys and blood vessels from damage" and it "replaces your diabetes medicine."

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The FDA says it has issued letters of warning to 15 companies that they are selling products for diabetes in violation of federal law.

To read the full FDA consumer alert on illegally sold diabetes treatments, go to