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Cosmetic products often contain a wide range of functional ingredients such as citric acid, glycerin, and cornstarch. Citric acid is helpful in the production of creams, lotions and soaps which help to adjust their pH levels during manufacture. Glycerin is often used as a humectant because it helps draw moisture from the air into the skin. Cornstarch is included for its ability to absorb excess oil from the skin surface. All these ingredients provide excellent benefits for skin texture and cosmetic manufacturers make sure to include them at optimal concentrations for maximum effect.