| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Matricaria recutita | Plant | -- | -- | Kameoka, H. and Nakai, K. 1987. Components of essential oil from the root of Glycyrrhiza-glabra. Nippon Gogeikagaku Kaishi 61(9): 1119-1122. | |
| Salvia officinalis | Shoot | -- | -- | * | |
| Vaccinium corymbosum | Fruit | -- | 3000.0 | 1.5 | * |
| Echinacea angustifolia | Leaf | -- | -- | Leung, A. Y. and Foster, S. 1995. Encyclopedia of Common Natural Ingredients 2nd Ed. John Wiley & Sons, New York. 649 pp. | |
| Digitalis purpurea | Leaf | -- | -- | * | |
| Lycopus europeus | Plant | -- | -- | List, P.H. and Horhammer, L., Hager's Handbuch der Pharmazeutischen Praxis, Vols. 2-6, Springer-Verlag, Berlin, 1969-1979. | |
| Teucrium chamaedrys | Plant | -- | 200.0 | -0.7 | * |
| Cynara cardunculus | Shoot | -- | -- | Jim Duke's personal files. | |
| Prunus persica | Flower | -- | -- | * | |
| Tilia sp. | Flower | -- | -- | * | |
| Prunus persica | Leaf | -- | -- | * | |
| Citrullus colocynthis | Fruit | -- | -- | * | |
| Rosa damascena | Pollen Or Spore | -- | 15000.0 | * | |
| Solidago virgaurea | Flower | -- | -- | * | |
| Arnica montana | Flower | -- | -- | * | |
| Symphytum officinale | Root | -- | -- | * | |
| Acacia nilotica | Plant | -- | -- | * | |
| Pinus sylvestris | Leaf | -- | -- | * | |
| Satureja montana | Shoot | -- | -- | * | |
| Vitis vinifera | Shoot | -- | -- | * |