| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Triticum aestivum | Seed | -- | -- | * | |
| Spirulina spp. | Plant | -- | -- | * | |
| Astragalus membranaceus | Root | -- | -- | * | |
| Tulipa gesneriana | Stem | -- | -- | List, P.H. and Horhammer, L., Hager's Handbuch der Pharmazeutischen Praxis, Vols. 2-6, Springer-Verlag, Berlin, 1969-1979. | |
| Inula helenium | Leaf | -- | -- | List, P.H. and Horhammer, L., Hager's Handbuch der Pharmazeutischen Praxis, Vols. 2-6, Springer-Verlag, Berlin, 1969-1979. | |
| Chrysanthemum coronarium | Bud | 370.0 | 4975.0 | * | |
| Juniperus communis | Fruit | -- | -- | * | |
| Citrus limon | Fruit Juice | -- | -- | Jim Duke's personal files. | |
| Datura stramonium | Plant | -- | -- | * | |
| Berberis vulgaris | Bark | -- | -- | * | |
| Myrciaria dubia | Fruit | -- | -- | Jim Duke's personal files. | |
| Corylus avellana | Leaf | -- | -- | * | |
| Nepeta cataria | Plant | -- | -- | * | |
| Berberis vulgaris | Leaf | -- | -- | Jim Duke's personal files. | |
| Thuja occidentalis | Branches | -- | -- | * | |
| Parthenium integrifolium | Root | -- | -- | * | |
| Juglans nigra | Hull Husk | -- | -- | * | |
| Acacia senegal | Plant | -- | -- | Pakistan Encyclopedia Planta Medica. 1986. | |
| Ginkgo biloba | Leaf | -- | -- | * | |
| Pothomorphe sp. | Plant | -- | -- | * |