From the Seattle Times:
If you pop a vitamin C tablet in your mouth, it’s a good bet it came from China. Indeed, many of the world’s vitamins are now made in China. 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.Chinese pharmaceutical companies also have taken over much of the world market in the production of antibiotics, analgesics, enzymes and primary amino acids. According to an industry group, China makes 70 percent of the world’s penicillin, 50 percent of its aspirin and 35 percent of its acetaminophen (often sold under the brand name Tylenol), as well as the bulk of vitamins A, B12, C and E. [Full Text]
See also the Times Argus article on vitamin quality control in the United States and the NPR report on the FDA’s rejections of imported food and vitamins from China.