Abstract
The word natural literally means something that is present in or produced by nature and not artificial or man-made (Spainhour, 2005). Although, many effective poisons are natural products (Schoental, 1965). When the word natural is used in written or verbiage form, many a times refer to something good or pure (Spainhour, 2005). Today, the term natural products are commonly understood to refer to herbs, herbal concoctions, dietary supplements, traditional medicine including Chinese traditional medicine, or other alternative medicine (Holt, and Chandra, 2002). In general, natural products are either of prebiotic origin or originate from microbes, plants, or animal sources (Nakanishi, 1999a; Nakanishi, 1999b). As chemicals, natural products include such classes of compounds as terpenoids, polyketides, amino acids, peptides, proteins, carbohydrates, lipids, nucleic acid bases, ribonucleic acid (RNA), deoxyribonucleic acid (DNA), and so forth. Natural products are an expression of organism’s increase in life complexity by nature (Jarvis, 2000).
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