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Phytosterols, which encompass plant sterols and stanols, are steroid compounds similar to cholesterol which occur in plants and vary only in carbon side chains and/ or presence or absence of a double bond. Stanols are saturated sterols, having no double bonds in the sterol ring structure. More than 200 sterols and related compounds have been identified.Free phytosterols extracted from oils are insoluble in water, relatively insoluble in oil, and soluble in alcohols.Phytosterols are widely recognized as a food additive with proven cholesterol-lowering efficacy.