| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Acacia catechu | Plant | -- | -- | * | |
| Ginkgo biloba | Leaf | -- | -- | List, P.H. and Horhammer, L., Hager's Handbuch der Pharmazeutischen Praxis, Vols. 2-6, Springer-Verlag, Berlin, 1969-1979. | |
| Anacardium occidentale | Seed | -- | -- | * | |
| Malus domestica | Fruit | -- | -- | * | |
| Hamamelis virginiana | Bark | -- | -- | * | |
| Theobroma cacao | Flower | -- | 27000.0 | ANON. 1948-1976. The Wealth of India raw materials. Publications and Information Directorate, CSIR, New Delhi. 11 volumes. | |
| Theobroma cacao | Seed | -- | -- | ANON. 1948-1976. The Wealth of India raw materials. Publications and Information Directorate, CSIR, New Delhi. 11 volumes. | |
| Pterocarpus marsupium | Stem Bark | -- | -- | * | |
| Pterocarpus marsupium | Bark | -- | -- | * | |
| Cola acuminata | Plant | -- | -- | * |