| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Agathosma betulina | Leaf | 200.0 | 500.0 | * | |
| Barosma betulina | Leaf | 200.0 | 500.0 | * | |
| Capsella bursa-pastoris | Plant | -- | -- | * | |
| Citrus limon | Fruit | -- | 5.0 | * | |
| Citrus limon | Leaf | -- | -- | Jim Duke's personal files. | |
| Citrus reticulata | Leaf | -- | -- | * | |
| Citrus sinensis | Pericarp | -- | -- | * | |
| Citrus sinensis | Flower | -- | -- | Jim Duke's personal files. | |
| Conium maculatum | Plant | 30000.0 | 40000.0 | 0.2 | * |
| Dictamnus albus | Leaf | -- | -- | List, P.H. and Horhammer, L., Hager's Handbuch der Pharmazeutischen Praxis, Vols. 2-6, Springer-Verlag, Berlin, 1969-1979. | |
| Hedeoma pulegioides | Plant | -- | 10000.0 | -1.3 | List, P.H. and Horhammer, L., Hager's Handbuch der Pharmazeutischen Praxis, Vols. 2-6, Springer-Verlag, Berlin, 1969-1979. |
| Hyssopus officinalis | Leaf | -- | -- | * | |
| Hyssopus officinalis | Plant | 30000.0 | 60000.0 | 1.1 | * |
| Hyssopus officinalis | Shoot | -- | -- | * | |
| Mentha spicata | Shoot | -- | -- | * | |
| Mentha spicata | Leaf | -- | -- | * | |
| Mentha pulegium | Shoot | -- | -- | * | |
| Mentha pulegium | Leaf | -- | -- | * | |
| Mentha longifolia | Plant | -- | -- | * | |
| Rosmarinus officinalis | Leaf | -- | -- | * |