Global sales have been estimated to be between $70 billion and $250 billion. This approximately 3-fold difference in estimates is due to the variation in what products are actually included in product sales results. As will be discussed, the definition of dietary supplements varies greatly from country to country; therefore, deriving sales data is complex.
Sugar see Carbohydrates: Chemistry and Classification; Regulation of Metabolism; Requirements and Dietary Importance; Galactose. Glucose: Chemistry and Dietary Sources; Metabolism and Maintenance of Blood Glucose Level; Glucose Tolerance. Sucrose: Nutritional Role, Absorption and Metabolism; Dietary Sucrose and Disease
Another difficulty in assessing sales of dietary supplements is the source from which sales data are gathered. Many business surveys rely on only one or two of the following sales outlets to derive their results:
• Supermarkets and mass merchandisers
• Natural food and health food stores
• Direct sales from Internet, mail order, practitioners, and multilevel marketing
• Pharmacies and drugstore chains
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