| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Cinnamomum camphora | Plant | -- | -- | * | |
| Pinus sylvestris | Leaf | -- | -- | * | |
| Mentha pulegium | Plant | 106.0 | 212.0 | Duke, J. A. Writeups or information summaries on approximately 2,000 economic plants, USDA, ARS, Beltsville, MD 20705. | |
| Mentha pulegium | Essential Oil | -- | 10600.0 | * | |
| Panax ginseng | Shoot | -- | -- | * |