Multibillion-dollar industry. Nutrition supplements are sold in supermarkets, drugstores, stores found in shopping malls, on the internet, and by direct marketing. Nutrition supplements include a broad range of individual and combinations of recognized nutrients, such as protein and amino acid preparations, essential fatty acids and fish oil, vitamins, and minerals, to more obscure substances and extracts such as co-enzyme Q10, ginseng, ginkgo biloba, hydroxy citric acid (HCA), kola nut, bilberry, grape seed extract, phytosterols, choline, lipoic acid, conjugated linoleic acid (CLA), and carnitine.
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