| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Valeriana officinalis | Plant | -- | -- | * | |
| Hyssopus officinalis | Plant | -- | -- | Jim Duke's personal files. | |
| Beta vulgaris | Leaf | -- | -- | List, P.H. and Horhammer, L., Hager's Handbuch der Pharmazeutischen Praxis, Vols. 2-6, Springer-Verlag, Berlin, 1969-1979. | |
| Oenothera biennis | Leaf | -- | -- | * | |
| Kalanchoe pinnata | Plant | -- | -- | * | |
| Papaver somniferum | Leaf | -- | -- | Jeffery B. Harborne and H. Baxter, eds. 1983. Phytochemical Dictionary. A Handbook of Bioactive Compounds from Plants. Taylor & Frost, London. 791 pp. | |
| Piper nigrum | Fruit | -- | 6.0 | -0.3 | * |
| Lycopersicon esculentum | Fruit | -- | 6.0 | -0.3 | * |
| Cinnamomum camphora | Plant | -- | -- | * | |
| Equisetum arvense | Plant | -- | 8000.0 | 0.2 | * |
| Origanum vulgare | Shoot | -- | -- | * | |
| Arctostaphylos uva-ursi | Plant | -- | -- | * | |
| Arctostaphylos uva-ursi | Leaf | -- | -- | * | |
| Artemisia dracunculus | Leaf | -- | 7640.0 | 0.3 | * |
| Ocimum basilicum | Leaf | -- | 19100.0 | 1.9 | * |
| Crataegus monogyna | Plant | -- | -- | Leung, A. Y. and Foster, S. 1995. Encyclopedia of Common Natural Ingredients 2nd Ed. John Wiley & Sons, New York. 649 pp. | |
| Magnolia kobus | Plant | -- | -- | * | |
| Citrus sinensis | Fruit Juice | -- | -- | Jim Duke's personal files. | |
| Actaea dahurica | Rhizome | -- | -- | Chemical Constituents of Oriental Herbs (3 diff. books) | |
| Foeniculum vulgare | Fruit | -- | -- | * |