Cinnamon Polyphenols, Explained

November 1, 2026

By Stabilicinn

Short answer: Polyphenols are a large family of natural plant compounds found in foods like tea, cocoa, berries and spices. Cinnamon is especially rich in a type called procyanidins, including the less common “type-A” form. Along with cinnamaldehyde (the compound responsible for cinnamon’s flavor and aroma), these are among the most studied components of cinnamon bark.

What polyphenols are

“Polyphenol” describes a chemical structure: molecules built from multiple phenol rings. Plants make thousands of different polyphenols, partly to protect themselves from UV light and pests. Familiar examples include the catechins in green tea, the anthocyanins that color blueberries, and the flavanols in cocoa.

The key compounds in cinnamon bark

Procyanidins (proanthocyanidins): chains of flavonoid units. Cinnamon is notable for “type-A” procyanidins, whose units are joined by two bonds rather than one. These have been isolated and characterized by researchers. See the research library.
Cinnamaldehyde: the main aromatic compound in cinnamon bark, which gives cinnamon its familiar warm, sweet scent.
Eugenol and camphor: the main components of cinnamon leaf oil and root oil, respectively. Bark, leaf and root produce noticeably different compositions.
Coumarin: present in high levels in Cassia and only negligible amounts in Ceylon cinnamon. More on coumarin.

Composition depends on species, plant part and process

The cinnamon tree produces a range of natural products with sweet aroma, taste and various properties, but their composition varies from species to species. Even within one tree, it depends on which part is used: oil from the leaves is mostly eugenol, while oil from the bark is mostly cinnamaldehyde. The extraction process matters too. That is why Stabilicinn specifies three things: the species (Cinnamomum zeylanicum), the part (the bark) and the process (a proprietary filtered-water extraction developed by Dr. Jayasena that retains highly efficacious polyphenolic compounds).

Antioxidant activity

In laboratory tests, many polyphenols, including those in cinnamon, show antioxidant activity: they can slow oxidation reactions that produce unstable molecules called free radicals. Scientific reviews of Ceylon cinnamon have catalogued antioxidant activity of its extracts in laboratory studies, alongside a wide range of other properties researchers have explored. See the composition section of our research library.