| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Juglans nigra | Essential Oil | -- | 5000.0 | * | |
| Carica papaya | Seed Oil | -- | -- | Jim Duke's personal files. | |
| Cnicus benedictus | Shoot | -- | -- | Jim Duke's personal files. | |
| Scutellaria baicalensis | Root Essent. Oil | -- | -- | * | |
| Centella asiatica | Essential Oil | -- | -- | * |