| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Rheum rhabarbarum | Leaf | -- | -- | * | |
| Ribes rubrum | Fruit | -- | -- | * | |
| Prunus cerasus | Stem | -- | -- | * | |
| Ribes uva-crispa | Fruit | -- | -- | * | |
| Euphorbia pulcherrima | Flower | -- | -- | * | |
| Ribes nigrum | Fruit | -- | -- | * | |
| Rubus idaeus | Plant | -- | -- | * | |
| Olea europaea | Fruit | -- | -- | List, P.H. and Horhammer, L., Hager's Handbuch der Pharmazeutischen Praxis, Vols. 2-6, Springer-Verlag, Berlin, 1969-1979. | |
| Punica granatum | Fruit | -- | -- | Seeram, N. P., Schulman, R. N., and Heber, D., eds. 2006. Pomegranates - Ancient Roots to Modern Medicine. Taylor & Francis. Boca Raton, FL. 244 pp. |