Most people don’t realize that supplements are not regulated in the same way that drugs are. The FDA has, in recent years, began to strengthen compliance. It started inspecting manufacturers’ facilities and found appalling conditions in over half of those it inspected. As law stands now, supplement manufacturers can sell products without proof of effectiveness. The burden of proof that it is unsafe, is up to those who suffer negative consequences. Supplement manufacturers voluntarily comply only with good manufacturing practices. Without stringent standards, like one imposed on drug companies, the industry is conceivably free to produce, for human consumption, tainted and dangerous products that you can buy at the health food store.
This article, published in the Chicago Tribune, is alarming. Be informed. It’s your body. The best way to get your nutrients is to eat a balanced diet. If you must use supplements, proceed with caution.