Cinnamomum verum
Procyanidin B2 can be found in "Cinchona pubescens" (Chinchona: in the rind, bark, and cortex), in "Cinnamomum verum" (Ceylon cinnamon: in the rind, bark, and cortex), in "Crataegus monogyna" (Common hawthorn: in the flower and blossom), in "Uncaria guianensis" (Cat's claw: in the root), in "Vitis vinifera" (Common grape vine: in the leaf), in "Litchi chinensis" (litchi: in the pericarp), in the apple, and in "Ecdysanthera utilis".