| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Mentha arvensis var. piperascens | Leaf | -- | 7300.0 | 0.8 | * |
| Mentha spicata | Leaf | 6200.0 | 6900.0 | 0.6 | * |
| Mentha spicata | Essential Oil | -- | -- | * | |
| Mentha arvensis var. piperascens | Essential Oil | -- | -- | Jim Duke's personal files. | |
| Mentha x rotundifolia | Leaf | 240.0 | 4000.0 | -1.4 | * |
| Carum carvi | Seed Essent. Oil | -- | -- | * | |
| Anethum graveolens | Seed Essent. Oil | -- | -- | * |