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Bread is made of agricultural products such as wheat flour, yeast, water and some salt. A bread may also include an improver, which is a mix of enzymes, emulsifiers and other functional ingredients (see ‘What is an enzyme?’ and ‘What is an emulsifier?’). Each of these ingredients helps to improve certain features of the bread. Bakers use different types of improvers to make sure the end result is exactly what their customers are looking for.