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U

Ubiquinone See Coenzyme Q UL See Tolerable Upper Intake Level Unsaturated fatty acids Fatty acids are commonly classified based on their

degree of saturation with hydrogen atoms, which is determined by the absence or presence of double bonds between carbon atoms. Unsaturated fatty acids have at least one double bond in their chain, which prevents saturation of the hydrocarbon chain hydrogen ions. Monounsaturated fatty acids have a single double bond, while polyunsaturated fatty acids have two or more double bonds.