| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Artemisia annua | Plant | -- | 40.0 | * | |
| Vitex agnus-castus | Fruit | -- | 1000.0 | * | |
| Vitex agnus-castus | Leaf | -- | -- | Jim Duke's personal files. | |
| Vitex agnus-castus | Seed | -- | 1000.0 | Jim Duke's personal files. | |
| Vitex agnus-castus | Shoot | -- | -- | * | |
| Vitex agnus-castus | Plant | -- | -- | * | |
| Achillea millefolium | Plant | -- | -- | Williamson, E. M. and Evans, F. J., Potter's New Cyclopaedia of Botanical Drugs and Preparations, Revised Ed., Saffron Walden, the C. W. Daniel Co., Ltd., Essex UK, 362 pp, 1988, reprint 1989. |