| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Phoenix dactylifera | Seed | -- | -- | Abstract (See species file) | |
| Pinus sylvestris | Plant | -- | -- | * | |
| Piper methysticum | Root | -- | -- | Leung, A. Y. and Foster, S. 1995. Encyclopedia of Common Natural Ingredients 2nd Ed. John Wiley & Sons, New York. 649 pp. | |
| Psidium guajava | Fruit | -- | -- | * | |
| Punica granatum | Fruit | -- | -- | ANON. 1948-1976. The Wealth of India raw materials. Publications and Information Directorate, CSIR, New Delhi. 11 volumes. | |
| Spinacia oleracea | Leaf | -- | -- | * | |
| Terminalia chebula | Fruit | -- | -- | List, P.H. and Horhammer, L., Hager's Handbuch der Pharmazeutischen Praxis, Vols. 2-6, Springer-Verlag, Berlin, 1969-1979. | |
| Trifolium pratense | Leaf | -- | -- | * | |
| Urtica dioica | Root | -- | -- | Blaschek, W., Hansel, R., Keller, K., Reichling, J., Rimpler, H., and Schneider, G. eds. 1998. Hager's Handbuch der Pharmazeutischen Praxis, Auflage Band 2 (A-K), 909 pp., (L-Z), 858 pp. Springer-Verlag, Berlin. | |
| Vigna mungo | Seed | -- | -- | * |