| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Piper nigrum | Fruit Essent. Oil | -- | 177800.0 | * | |
| Panax ginseng | Root Essent. Oil | -- | 18000.0 | * | |
| Sarracenia flava | Essential Oil | -- | -- | * | |
| Petasites hybridus | Root | -- | -- | * | |
| Magnolia denudata | Leaf Essent. Oil | -- | -- | * | |
| Kaempferia galanga | Plant | -- | -- | * | |
| Oenanthe javanica | Shoot | -- | -- | * | |
| Kaempferia galanga | Rhizome | -- | -- | * | |
| Panax ginseng | Plant | -- | -- | * | |
| Carica papaya | Seed Oil | -- | -- | Jim Duke's personal files. | |
| Vanilla planifolia | Fruit | -- | -- | * | |
| Citrullus lanatus | Fruit Juice | -- | -- | * | |
| Scutellaria baicalensis | Root Essent. Oil | -- | -- | * | |
| Melissa officinalis | Tissue Culture | -- | -- | Gbolade, A.A. and Lockwood, G.B. 1991. The Constituents of Melissa officinalis L. Cultures. J. Ess. Oil Res., 3: 111-114. |