| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Origanum majorana | Plant | -- | 182000.0 | List, P.H. and Horhammer, L., Hager's Handbuch der Pharmazeutischen Praxis, Vols. 2-6, Springer-Verlag, Berlin, 1969-1979. | |
| Turnera diffusa | Shoot | -- | 130.0 | * | |
| Harpagophytum procumbens | Tuber | -- | -- | * | |
| Prunus africana | Bark | -- | -- | * | |
| Salvia officinalis | Plant | -- | -- | * | |
| Petasites hybridus | Root | -- | -- | * | |
| Clematis vitalba | Plant | -- | -- | * | |
| Psoralea corylifolia | Seed | -- | -- | * | |
| Sambucus nigra | Leaf | -- | -- | Jim Duke's personal files. | |
| Coriandrum sativum | Seed | -- | -- | * | |
| Ligustrum japonicum | Flower | -- | -- | * | |
| Plantago ovata | Seed Coat | -- | -- | * | |
| Eriodictyon californicum | Bark | -- | -- | * | |
| Eriodictyon californicum | Shoot | -- | -- | * | |
| Cocos nucifera | Seed Oil | -- | -- | Jim Duke's personal files. | |
| Kalanchoe pinnata | Leaf | -- | -- | * | |
| Vanilla planifolia | Fruit | -- | -- | * | |
| Carica papaya | Seed Oil | -- | -- | Jim Duke's personal files. | |
| Pastinaca sativa | Seed | -- | -- | * | |
| Thymus vulgaris | Plant | -- | -- | List, P.H. and Horhammer, L., Hager's Handbuch der Pharmazeutischen Praxis, Vols. 2-6, Springer-Verlag, Berlin, 1969-1979. |