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Ester Definition: An ester is an organic compound where the hydrogen in the compound's carboxyl group is replaced with a hydrocarbon group. Examples: Ethyl acetate is an ester. The hydrogen on the carboxyl group of acetic acid is replaced with an ethyl group. Article. Chemistry.
Ester C is a pH neutral product with Vitamin C metabolites which are natural and facilitate quick absorption. The biological functions of ester C are same as vitamin C. It serves almost all the main functions such as protection of skin, joints and vision, antioxidant properties etc.