| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Malus domestica | Fruit | -- | 1340.0 | * | |
| Althaea officinalis | Plant | -- | -- | Wealth of India. | |
| Prunella vulgaris | Inflorescence | -- | -- | * | |
| Piper methysticum | Rhizome | -- | -- | Hansel, R., Keller, K., Rimpler, H., and Schneider, G. eds. 1992. Hager's Handbuch der Pharmazeutischen Praxis, Drogen (A-D), 1209 pp., 1993 (E-O), 970 pp., 1994 (P-Z), 1196 pp. Springer-Verlag, Berlin. | |
| Adiantum capillus-veneris | Leaf | -- | -- | * | |
| Armoracia rusticana | Plant | -- | -- | Newall, C. A., Anderson, L. A. and Phillipson, J. D. 1996. Herbal Medicine - A Guide for Health-care Professionals. The Pharmaceutical Press, London. 296pp. | |
| Cichorium endivia | Leaf | -- | -- | * | |
| Rubus idaeus | Juice | -- | -- | * | |
| Plantago major | Leaf | -- | -- | * | |
| Morus alba | Leaf | -- | -- | * | |
| Solidago virgaurea | Flower | -- | -- | * |