Sandwich chain Subway has announced plans to drop the additive azodicarbonamide from its fresh-baked breads. Above, Subway founder Fred DeLuca poses carrying bread for sandwiches. Jonathan Nackstrand /AFP/Getty Images hide caption

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A man buys meat at a butcher's stand in Moscow's Dorogomilovsky market in 2011. On Monday, Russia began blocking U.S. meat imports until those imports are ractopamine-free. Natalia Kolesnikova/AFP/Getty Images hide caption

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A photo from 2009 shows "All Natural" Necco Wafers. But after customers rejected the changes, the Massachusetts company returned to its original recipe.

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Lazy Cakes, now sold as Lazy Larry, contain melatonin. The Food and Drug Administration says that ingredient, which helps regulate sleep, is not an approved additive for food. hide caption

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