| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Piper nigrum | Fruit | 5000.0 | 150000.0 | 1.0 | * |
| Xylopia aethiopica | Seed | -- | 9100.0 | 1.0 | List, P.H. and Horhammer, L., Hager's Handbuch der Pharmazeutischen Praxis, Vols. 2-6, Springer-Verlag, Berlin, 1969-1979. |
| Piper cubeba | Fruit | 2000.0 | 4000.0 | -1.0 | * |
| Piper nigrum | Stem | -- | 1100.0 | * | |
| Anethum graveolens | Seed | -- | 28.6 | -1.0 | * |
| Piper nigrum | Seed Essent. Oil | -- | -- | * | |
| Piper nigrum | Root | -- | -- | * | |
| Piper nigrum | Leaf Essent. Oil | -- | -- | * | |
| Piper nigrum | Leaf | -- | -- | * | |
| Piper nigrum | Seed Oil | -- | -- | * | |
| Piper nigrum | Shoot | -- | -- | * | |
| Piper nigrum | Seed | -- | -- | * |