Caffeic acid is an organic compound that is classified as a hydroxycinnamic acid. This yellow solid consists of both phenolic and acrylic functional groups. It is found in all plants because it is a key intermediate in the biosynthesis of lignin, one of the principal components of woody plant biomass and its residues.

Pharmacologic action

Like many other polyphenols, caffeic acid is an antioxidant. This means that it can slow oxidative stress in the body and fight the free radicals this stress produces. Oxidative stress is linked to faster progression of the aging process and many other health issues, including cancer and dementia.
Some skin and body care companies add caffeic acid to products because of its antioxidant properties.A handful of manufacturers offer caffeic acid supplements.Most research has found that caffeic acid can slow or reverse inflammation.Research has also found that caffeic acid is safe, even in relatively large doses.

Uses

There are a number of different uses of caffeic acid, including:Fighting cancer、selection of fruit and veg.
Caffeic acid can be found in a variety of food including fruit and vegetables.

Correlational research

Although the research is preliminary, some studies suggest that caffeic acid might slow cancer development or prevent the disease altogether.
One study from 2015 used 1,090 people with breast cancer to look at the effect of caffeine and caffeic acid on breast cancer growth in relation to the condition's estrogen receptor status. It concluded that caffeine and caffeic acid demonstrated anticancer properties and suppressed the growth of estrogen receptor cells.