| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Zea mays | Cob | -- | -- | * | |
| Vanilla planifolia | Fruit | -- | 10.0 | * | |
| Zea mays | Seed | -- | -- | * | |
| Lycopersicon esculentum | Plant | -- | -- | * | |
| Coriandrum sativum | Plant | -- | 0.1 | * | |
| Quercus rubra | Wood | -- | -- | * | |
| Vitis vinifera | Leaf | -- | -- | * | |
| Juglans regia | Seed | 6.0 | 12.0 | * | |
| Juglans regia | Testa | 200.0 | 325.0 | * | |
| Serenoa repens | Wood | -- | -- | List, P.H. and Horhammer, L., Hager's Handbuch der Pharmazeutischen Praxis, Vols. 2-6, Springer-Verlag, Berlin, 1969-1979. | |
| Cocos nucifera | Leaf | -- | -- | List, P.H. and Horhammer, L., Hager's Handbuch der Pharmazeutischen Praxis, Vols. 2-6, Springer-Verlag, Berlin, 1969-1979. |