[1] Of the myriad occurrences, p-coumaric acid can be found in Gnetum cleistostachyum.

[2] p-Coumaric acid can be found in a wide variety of edible plants and fungi such as peanuts, navy beans, tomatoes, carrots, basil and garlic.

[5] p-Coumaric acid glucoside can also be found in commercial breads containing flaxseed.

Coumaric acid is sometimes added to microbiological media, enabling the positive identification of Brettanomyces by smell.

[11] p-Coumaric acid is found as the base moiety of Caleicine, one of many sesquiterpenes in Calea ternifolia.