Dietary supplements encompass a wide range of products that includes vitamins and minerals, herbal products, amino acids, tissue extracts and other compounds. Many dietary supplements - which I'll refer to as supplements - are extremely helpful in preventing illness; for example, folic acid can prevent birth defects, and calcium and vitamin D can prevent fractures.
However, not all supplements are effective. There are tens of thousands of supplements sold in the US, and while some are very effective, many are not. Even worse, some might actually cause more harm than good. Little is known about the safety of supplements, because Congress requires that the US Food and Drug Administration (FDA) assume that all supplements are harmless until proven otherwise. Because the government does not ensure supplement safety, it's especially important that consumers are careful when purchasing supplements.
Here I'll summarize some of the most important safety concerns with supplements and then provide advice for selecting supplements safely.
http://www.doctoroz.com/videos/hidden-dangers-dietary-supplement
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