The bioactive substance berberine comes from the plant genus Berberis: it is present in the roots, trunk, bark and also in the berries. The barberry is one of the best-known plants in this family. This shrub is native to Eurasia. Berberine is found in the following plants: European [[European Barberry]], [[Goldenseal]], [[Goldthread]], [[Oregon Grape]], [[Bloodroot]], [[Phellodendron]] and [[Tree Turmeric]].
==Special Precautions of Berberine==