The Seatle Times reported that "in less than a decade, China has captured 90 percent of the U.S. market for vitamin C, driving almost everyone else out of business." According to an industry group, China also makes the bulk of vitamins A, B12, C and E. The problem is quality, corruption and public safety.  Jan Willem Roben of Vision Ingredients in Shanghai, a broker of food additives for export, stated simply: "Sometimes you enter a factory, and you say, 'I can't believe they produce food here.' It's dirty and the machines are old". The article also reported something telling...that the three-fifths of the Chinese themselves are concerned about the quality and safety of what they produce. It goes on to explain that"U.S. laws don't require food and drug sellers to label products with the country of origin of ingredients, it's impossible for consumers to know where food or supplements are coming from, not to mention what factory produced them."