Definition: Gallicolae, also known as gallic acid or gallic acid ester, is a type of fatty acid that is commonly found in animal and human foods. It has a unique chemical structure with an α-lactose (galactose) side chain attached to the C-17 carbon. Gallic acid is a major constituent of milk, eggs, and some fruits and vegetables. Gallic acid ester can be used as a food additive in various products such as beverages,