Fumaric acid is a naturally occurring organic acid that is widely found in many fruits and vegetables, including apples, grapes, carrots, and mushrooms. It is commonly used as a food additive in the food and beverage industry as a souring agent, flavor enhancer, and preservative in a variety of products, such as soft drinks, fruit juices, candy, baked goods, and processed meats.
Fumaric acid has been reported to cause gastrointestinal side effects such as abdominal pain, nausea, and diarrhea in some individuals. Fatigue, dizziness, headaches are also possibilities.
Evaluation of Fumaric acid and Maleic acid as Internal Standards for NMR Analysis of Protein Precipitated Plasma, Serum and Whole Bloodhttps://www.ncbi.nlm.nih.gov/pmc/articles/PMC8822163/
Fumaric Acid Esters (Fumaderm)https://www.ouh.nhs.uk/patient-guide/leaflets/files/12362Pfumaderm.pdf