| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Stellaria media | Plant | -- | -- | Leung, A. Y. and Foster, S. 1995. Encyclopedia of Common Natural Ingredients 2nd Ed. John Wiley & Sons, New York. 649 pp. | |
| Aloe vera | Plant | -- | -- | * | |
| Pluchea carolinensis | Plant | -- | -- | Tramil | |
| Paris polyphylla | Rhizome | -- | -- | * | |
| Schisandra chinensis | Seed | -- | 1000.0 | -1.0 | List, P.H. and Horhammer, L., Hager's Handbuch der Pharmazeutischen Praxis, Vols. 2-6, Springer-Verlag, Berlin, 1969-1979. |
| Cucurbita pepo | Seed | -- | 10000.0 | 1.0 | Bisset, N.G., ed. 1994. Herbal Drugs and Phytopharmaceuticals. CRC Press. Boca Raton, FL. 566 pp. |