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The lipid bilayer is made of phospholipids. They are arranged in a double layer because one of their ends is attracted to water while the other is repelled by water.
People about to have surgery must tell their health care providers about all supplements they take.
People with high total cholesterol have about two times the risk for heart disease as people with ideal levels.
In 1844, Charles Goodyear obtained the first patent for a rubber condom.
An identified risk factor for osteoporosis is the intake of excessive amounts of vitamin A. Dietary intake of approximately double the recommended daily amount of vitamin A, by women, has been shown to reduce bone mineral density and increase the chances for hip fractures compared with women who consumed the recommended daily amount (or less) of vitamin A.