Procyanidin

Figure 1. The chemical structure of epicatechin, a building block of Procyanidins.

Procyanidins are members of the Proanthocyanidin (or condensed tannins) class of flavonoids. They are oligomeric compounds, formed from catechin and epicatechin molecules. Procyanidins can be found in many plants, most notably apples, maritime pine bark, cinnamon, aronia fruit, cocoa beans, grape seed, grape skin, red wines of Vitis vinifera (the common grape), bilberry, cranberry, blackcurrant, green tea, and black tea.

For nutritional values, refer to the Codex entry for Oligomeric Proanthocyanidins.