| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Piper cubeba | Fruit | 1400.0 | 2600.0 | 0.7 | * |
| Piper nigrum | Fruit | 606.0 | 2700.0 | 0.7 | * |
| Hordeum vulgare | Seed | -- | 1.0 | * | |
| Humulus lupulus | Inflorescence | -- | 2.5 | * | |
| Apium graveolens | Pt | -- | 1.0 | * | |
| Nicotiana tabacum | Leaf | -- | -- | ANON. 1948-1976. The Wealth of India raw materials. Publications and Information Directorate, CSIR, New Delhi. 11 volumes. | |
| Capsicum annuum | Fruit | -- | 5.2 | -1.4 | * |
| Anabasis aphylla | Plant | -- | -- | * | |
| Humulus lupulus | Flower | -- | 2.5 | * | |
| Laurus nobilis | Leaf | -- | -- | * | |
| Glycine max | Seed | -- | -- | List, P.H. and Horhammer, L., Hager's Handbuch der Pharmazeutischen Praxis, Vols. 2-6, Springer-Verlag, Berlin, 1969-1979. | |
| Piper nigrum | Seed | -- | -- | * | |
| Piper nigrum | Essential Oil | -- | -- | * |