| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Laurus nobilis | Leaf | -- | -- | Leung, A. Y. and Foster, S. 1995. Encyclopedia of Common Natural Ingredients 2nd Ed. John Wiley & Sons, New York. 649 pp. | |
| Peumus boldus | Leaf | -- | 1000.0 | * | |
| Sassafras albidum | Root | -- | -- | CRC Handbook of Medicinal Herbs and/or CRC Handbook of Proximate Analyses |