| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Zanthoxylum clava-herculis | Root Bark | -- | -- | * | |
| Zanthoxylum americanum | Root Bark | -- | -- | * | |
| Zanthoxylum americanum | Bark | -- | -- | Leung, A. Y. and Foster, S. 1995. Encyclopedia of Common Natural Ingredients 2nd Ed. John Wiley & Sons, New York. 649 pp. | |
| Zanthoxylum americanum | Plant | -- | -- | * | |
| Zanthoxylum clava-herculis | Bark | -- | -- | Leung, A. Y. and Foster, S. 1995. Encyclopedia of Common Natural Ingredients 2nd Ed. John Wiley & Sons, New York. 649 pp. | |
| Zanthoxylum americanum | Stem Bark | -- | -- | * | |
| Phellodendron amurense | Bark | -- | -- | * | |
| Lophophora williamsii | Plant | -- | -- | * | |
| Hordeum vulgare | Sprout Seedling | -- | -- | * |