| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Vitex agnus-castus | Leaf | -- | 6.0 | -0.4 | Ekundayo, O., Laakso, I., Holopainen, M., Hiltunen, R., Oguntimein, B., and Kauppinen, V. 1990. The Chemical Composition and Antimicrobial Activity of the Leaf Oil of Vitex agnus-castus L. J. Essential Oil Research, 2: 115-119. |
| Vitex agnus-castus | Flower | -- | -- | Jim Duke's personal files. | |
| Vitex agnus-castus | Fruit | 590.0 | 4000.0 | -0.2 | * |
| Vitis vinifera | Plant | -- | -- | Stitt, Paul. Why George should eat broccoli. | |
| Zanthoxylum alatum | Fruit | -- | -- | ANON. 1948-1976. The Wealth of India raw materials. Publications and Information Directorate, CSIR, New Delhi. 11 volumes. | |
| Zea mays | Seed Essent. Oil | -- | -- | * | |
| Zea mays | Leaf | -- | -- | * | |
| Zea mays | Silk Stigma Style | -- | -- | * | |
| Zea mays | Husk Essent. Oil | -- | -- | * | |
| Zea mays | Silk Essent. Oil | -- | 7000.0 | * | |
| Zingiber officinale | Rhizome | 17.0 | 1050.0 | 0.7 | * |
| Zingiber officinale | Rhizome Essent. Oil | -- | 21000.0 | 1.4 | * |