| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Opuntia ficus-indica | Flower | -- | -- | * | |
| Linum usitatissimum | Seed | -- | -- | List, P.H. and Horhammer, L., Hager's Handbuch der Pharmazeutischen Praxis, Vols. 2-6, Springer-Verlag, Berlin, 1969-1979. | |
| Petasites hybridus | Root | -- | -- | * | |
| Panax quinquefolius | Root | -- | -- | * | |
| Nardostachys chinensis | Root | -- | -- | * | |
| Citrullus colocynthis | Seed | -- | -- | * | |
| Camellia sinensis | Seed Oil | -- | -- | * | |
| Camellia sinensis | Leaf | -- | -- | * | |
| Artemisia capillaris | Essential Oil | -- | -- | * | |
| Lonicera japonica | Flower | -- | -- | * | |
| Aquilegia vulgaris | Seed | -- | -- | * | |
| Carica papaya | Seed | -- | -- | * | |
| Achillea millefolium | Plant | -- | -- | List, P.H. and Horhammer, L., Hager's Handbuch der Pharmazeutischen Praxis, Vols. 2-6, Springer-Verlag, Berlin, 1969-1979. | |
| Mentha pulegium | Essential Oil | -- | -- | * | |
| Morus alba | Seed | -- | -- | * | |
| Spartium junceum | Seed | -- | -- | * | |
| Silybum marianum | Seed | -- | -- | * | |
| Echinacea angustifolia | Root | -- | -- | * | |
| Annona muricata | Plant | -- | -- | * | |
| Myristica fragrans | Essential Oil | -- | -- | * |