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The term herb has usually been used to refer to any plant or plant part valued for its medicinal, savory, or aromatic qualities. For the purposes of this website, herb means any plant that is primarily used for medicinal purposes. There are approximately 380,000 species of plants on earth that we have identified and several hundred thousand that have yet to be discovered. Out of the number of known plants, about 260,000 are classified as higher plants, which means that they contain chlorophyll and perform a process called photosynthesis. In photosynthesis, plants utilize the energy provided by sunlight to manufacture carbohydrates from carbon dioxide and water. All the members of the higher plant group have the potential to offer medical benefits. Only 10 percent, however, have actually been studied for this purpose. The living cells of plants can be likened to miniature chemical factories. They take in raw materials--carbon dioxide, water, and sunlight--and convert them into useful nutrients. Oxygen is a by-product of this process. Many herbs are rich in compounds that are pharmacologically active, that is, they exert a profound effect on certain animal tissues and organs. Therefore, they can be used as drugs in treating, curing, or preventing disease. Please take a moment to view this list of unsafe herbs before you move on.
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