Fumaric acid is a naturally occurring organic acid that is found in many fruits and vegetables, including apples, grapes, and mushrooms. It is often used as a food additive and dietary supplement, including in some protein powders, due to its potential health benefits.
In protein powders, fumaric acid may be added as a source of acidity to enhance the flavor and taste of the product. It is also sometimes added as a preservative to help extend the shelf life of the product.
Additionally, fumaric acid has been shown to have potential therapeutic benefits for certain medical conditions, including psoriasis and multiple sclerosis. It is thought to work by modulating the immune system and reducing inflammation in the body.
Fumaric acid is generally considered safe when consumed in recommended amounts.