I-Fumaric acid iyi-dicarboxylic acid eyinhlanganisela yekristalu engenambala enefomula yamakhemikhali ethi C4H4O4. Yaziwa nangokuthi i-trans-butenedioic acid futhi iyi-asidi etholakala ngokwemvelo etholakala ezitshalweni nasezithelweni ezihlukahlukene. I-Fumaric acid ivame ukusetshenziswa embonini yokudla njenge-acidulant, isithuthukisi ukunambitheka, kanye nesilungisi se-pH, kanye nasekukhiqizeni amakhemikhali ahlukahlukene, ama-resin, nama-polymers. Iphinde isetshenziswe ekwelapheni izimo ezithile zezokwelapha ezifana ne-psoriasis kanye ne-multiple sclerosis.