Nearly all of the herbal dietary supplements tested in a Congressional investigation contained trace amounts of lead and other contaminants, and some supplement sellers made illegal claims that their products can cure cancer and other diseases, investigators found.
The levels of heavy metals — including mercury, cadmium and arsenic — did not exceed thresholds considered dangerous, the investigators found. However, 16 of the 40 supplements tested contained pesticide residues that appeared to exceed legal limits, the investigators found. In some cases, the government has not set allowable levels of these pesticides because of a paucity of scientific research.
Investigators found at least nine products that made apparently illegal health claims, including a product containing ginkgo biloba that was labeled as a treatment for Alzheimer’s disease and a product containing ginseng labeled as a treatment to prevent diabetes and cancer. They also described a salesperson at a supplement specialty store who claimed that a garlic supplement could be taken instead of blood pressure medication.
Any product that claims to treat, cure, prevent or mitigate a disease is considered a drug and must go through strict regulatory reviews.
The report, which was prepared by the Government Accountability Office, was provided to The New York Times and will be made public at a Senate hearing on Wednesday. Its release comes two weeks before the Senate is scheduled to begin debate on a landmark food safety bill that is expected to substantially increase the federal government’s authority over food manufacturers.
But it is uncertain how tough the bill will be on supplement manufacturers, and it has been the subject of fierce lobbying. Capitol Hill staff members familiar with the process said the bill was unlikely to include provisions opposed by supplement manufacturers.
Dr. Joshua M. Sharfstein, principal deputy commissioner of the Food and Drug Administration, said in an interview that he was not concerned about the safety of the supplements tested by the G.A.O. investigators. But Dr. Sharfstein noted that the agency had recently announced a recall of Vita Breath, a dietary supplement that it said might contain hazardous levels of lead.
Steve Mister, president of the Council for Responsible Nutrition, a trade association representing the dietary supplement industry, said it was not surprising that herbal supplements contained trace amounts of heavy metals, because these are routinely found in soil and plants. “I don’t think this should be of concern to consumers,” Mr. Mister said.
Senator Herb Kohl, a Wisconsin Democrat who will preside over Wednesday’s hearing of the Senate Special Committee on Aging, said that while improvements had been made in recent years in the oversight of supplements, “the F.D.A. needs the authority and tools to ensure that dietary supplements are as safe and effective as is widely perceived by the Americans who take them.”
Among the witnesses at the hearing will be Dr. Tod Cooperman, president of ConsumerLab.com, a company that has tested over 2,000 dietary supplements made by more than 300 manufacturers and has found that one in four have quality problems. According to Dr. Cooperman’s written testimony, the most common problems are supplements that lack adequate quantities of the indicated ingredients and those contaminated with heavy metals.
Travis T. Tygart, chief executive of the United States Anti-Doping Agency, wrote a letter to the committee saying that some athletes have been rendered ineligible for international competitions because they took supplements that contained steroids not listed on the products’ labels. There are thousands of supplements available for sale that contain steroids or other harmful ingredients, he wrote.
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