| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Anethum graveolens | Leaf | -- | -- | * | |
| Citrus sinensis | Pericarp | -- | -- | * | |
| Citrus paradisi | Leaf | -- | -- | CRC Handbook of Medicinal Herbs and/or CRC Handbook of Proximate Analyses | |
| Citrus limon | Leaf | -- | -- | Jim Duke's personal files. | |
| Mentha x piperita | Leaf | -- | -- | * | |
| Citrus sinensis | Flower | -- | -- | Jim Duke's personal files. | |
| Ligustrum lucidum | Leaf | -- | -- | * |