| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Zea mays | Silk Essent. Oil | 2000.0 | 10000.0 | * | |
| Hyssopus officinalis | Flower | 1.0 | 10.0 | Flavour and Fragrance Journal, 6: 72. | |
| Hyssopus officinalis | Leaf | 1.0 | 15.0 | Flavour and Fragrance Journal, 6: 72. | |
| Mentha pulegium | Essential Oil | -- | -- | Duke, J. A. Writeups or information summaries on approximately 2,000 economic plants, USDA, ARS, Beltsville, MD 20705. | |
| Sambucus nigra | Flower Essent. Oil | -- | -- | * | |
| Sambucus nigra | Leaf Essent. Oil | -- | -- | * | |
| Pinus sylvestris | Flower | -- | -- | * | |
| Juglans nigra | Essential Oil | -- | 15000.0 | * | |
| Glycyrrhiza glabra | Root | -- | -- | * | |
| Glycyrrhiza glabra | Rhizome Essent. Oil | -- | -- | * | |
| Stevia rebaudiana | Plant | -- | 9000.0 | Kinghorn, A. D. (Ed.) 2002. Medicinal and Aromatic Plants - Industrial Profiles. Stevia. The genus Stevia. Taylor & Francis. New York, NY. 211 pp. | |
| Zingiber officinale | Rhizome | -- | -- | * | |
| Aspalathus linearis | Leaf Essent. Oil | -- | 700.0 | * | |
| Zea mays | Plant | -- | -- | * | |
| Cinnamomum verum | Leaf Essent. Oil | -- | -- | * | |
| Cinnamomum verum | Stem Bark | -- | -- | * | |
| Cinnamomum verum | Root Bark | -- | -- | * | |
| Vanilla planifolia | Fruit | -- | -- | * | |
| Vaccinium myrtillus | Fruit Juice | -- | 0.02 | * | |
| Citrullus lanatus | Fruit Juice | -- | -- | * |