| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Dryopteris marginalis | Plant | -- | -- | List, P.H. and Horhammer, L., Hager's Handbuch der Pharmazeutischen Praxis, Vols. 2-6, Springer-Verlag, Berlin, 1969-1979. | |
| Panax ginseng | Leaf | -- | -- | * | |
| Artemisia dracunculus | Leaf | -- | -- | * | |
| Ricinus communis | Seed | -- | -- | List, P.H. and Horhammer, L., Hager's Handbuch der Pharmazeutischen Praxis, Vols. 2-6, Springer-Verlag, Berlin, 1969-1979. | |
| Harpagophytum procumbens | Root | -- | -- | * | |
| Carica papaya | Fruit | -- | -- | USDA's Ag Handbook 8 and sequelae) | |
| Morus alba | Leaf | -- | -- | * | |
| Valeriana officinalis | Root | -- | -- | * | |
| Trifolium pratense | Plant | -- | -- | * | |
| Tilia sp. | Fruit | -- | -- | * |