Wheat bran is a milled residue of the wheat grain that consists of the germ, aleurone layer, endosperm and pericarp. 

The phytochemical composition of wheat bran shows micronutrients and bioactive compounds of which approximately 52% are carbohydrates but not starch, 15% starch, 10% protein, 5% minerals, 4% fat.

Some organic acids of interest to human health are present in wheat bran: ferulic acid, caffeic acid, syringic acid, p-cumaric acid, vanillic acid.