Bioavailability is an essential tool in pharmacokinetics and must be considered when calculating dosages for non-intravenous routes of administration. In recent years, there has been a surge in the botanical supplement industry with widespread sales of herbal products in pharmacies, health food stores, and other outlets. This book examines the bioavailability and metabolism of popularly consumed natural products, including major classes of chemical compounds such as polyphenols, flavonoids, proanthocyanidins, and hydrolysable tannins. The text reviews the bioavailability and metabolism of these compounds in relation to their impact on human health and disease.