Fumaric acid is widely found organically in nature, and it can also be synthesized. It is used commercially as an ingredient in plastic, paint and food processing, according to SRI Consulting,
Fumaric acid is an intermediate in the Krebs cycle, which is essential in cellular respiration and the production of energy. Fumaric acid is found in both plants and mammals, according to Bartek Ingredients.
Fumaric acid is more sour than other organic food acids and is used as a flavor enhancer and a preservative in flour products, wine, candy, preserves and pie fillings, gelatin products and fruit-flavored drinks. About 33 percent of commercial fumaric acid is used in food and beverage processing.
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Fumaric acid is also an ingredient in diverse products such as bath salts, denture cleaners, inks and resins used in paint and building materials, according to Bartek Ingredients.