Fumaric acid, rhizomes of Ferula ferulae in Umbelliferae and Ligusticum chuanxiong. , the whole grass of Lycopodium of Selaginellaceae, the whole grass of Equisetum of Equisetum of Equisetum of Equisetum, the rhizome of Cimicifuga of Ranunculaceae, the seed coat of Gramineae rice, the roots, bulbs and leaves of onion of Liliaceae, the roots of radish of Cruciferae, the bark of catalpa of Asteraceae, the yellow flower of Huang Ju of Compositae, and the roots of bougainvillea.

Ferulic acid, whose chemical name is 4- hydroxy -3- methoxycinnamic acid, is one of the derivatives of cinnamic acid (also known as cinnamic acid, 3- phenyl 2- acrylic acid, molecular structure). Ferulic acid was first discovered in the seeds and leaves of plants, and it is a kind of phenolic acid widely existing in plants. It combines with polysaccharide and protein in the cell wall to form the skeleton of the cell wall.

It is high in Ferula, Angelica, Chuanxiong, Cimicifuga, Ziziphus Spinosae and other Chinese herbal medicines. It is one of the effective components of these traditional Chinese medicines and has been regarded as one of the quality indexes of Chinese patent medicines. Among food raw materials, the content of ferulic acid in coffee, chaff, vanilla bean, wheat bran and rice bran is also high. In recent years, studies on pharmacological effects have found that many ferulic acids and their derivatives have pharmacological effects and biological activities, and have low toxicity, so they are widely used in medicine, health care products, cosmetic raw materials and food additives.