| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Vaccinium myrtillus | Fruit | -- | -- | * | |
| Vaccinium corymbosum | Fruit | -- | -- | * | |
| Vitis vinifera | Fruit | -- | -- | List, P.H. and Horhammer, L., Hager's Handbuch der Pharmazeutischen Praxis, Vols. 2-6, Springer-Verlag, Berlin, 1969-1979. | |
| Berberis vulgaris | Fruit | -- | -- | Jim Duke's personal files. | |
| Vitis vinifera | Exocarp | -- | -- | * | |
| Vitis vinifera | Pericarp | -- | -- | * |