Cinnamic acid is an organic compound with the formula C6H5CH=CHCOOH. It is a white crystalline compound that is slightly soluble in water, and freely soluble in many organic solvents. Classified as an unsaturated carboxylic acid, it occurs naturally in a number of plants. It exists as both a cis and a trans isomer, although the latter is more common.
Cinnamic acid is a central intermediate in the biosynthesis of myriad natural products include lignolsto lignin and lignocellulose, flavonoids, isoflavonoids, coumarins, aurones, stilbenes, catechin, and phenylpropanoids. Its biosynthesis is performed by action of the enzyme phenylalanine ammonia-lyase (PAL) on phenylalanine.

1.Cinnamic acid flavor:used as fixed sweet agent  in Beverages, cold drinks, candy, alcohol .

2.Cinnamic acid has a strong sterilization, anti-corrosion effect as food.

3.Cinnamic acid can be used for synthetic treatment of coronary heart disease. It is an important drug lactic
acid can and heartache flat, and synthetic baclofen and cinnamon benzene piperazine.

4.Cinnamic acid significant antioxidant efficacy to slow down the wrinkles have very good curative effect.