Fumaric acid is an organic compound with the formula HO₂CCH=CHCO₂H. A white solid, fumaric acid occurs widely in nature. It has a fruit-like taste and has been used as a food additive. Its E number is E297. The salts and esters are known as fumarates. Fumarate can also refer to the C₄H₂O²⁻₄ ion. Fumaric acid is the trans isomer of butenedioic acid, while maleic acid is the cis isomer.

Skin Benefits

Fumaric acid is not just found in plants though, when exposed to natural light, skin naturally makes fumaric acid, and that is the reason that it was originally used. It was used to treat an autoimmune condition called psoriasis. This condition is thought to be a genetic disease that is caused by environmental factors and has symptoms of itchy and red skin.

It is considered practically non-toxic but as the saying goes, everything in moderation, as large doses could be potentially deleterious or lead to side effects. Therefore, fumaric acid and its derivatives are approved for consumption by the FDA.

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