| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Harpagophytum procumbens | Tuber | -- | -- | * | |
| Harpagophytum procumbens | Root | -- | -- | * | |
| Helianthus annuus | Seed | -- | -- | Rizk, A.F.M. and Al-Nowaihi, A.S., The Phytochemistry of the Horticultural Plants of Qatar, Scientific and Applied Research Centre, University of Qatar. | |
| Hypericum perforatum | Plant | -- | -- | * | |
| Juniperus communis | Leaf | -- | -- | * | |
| Laurus nobilis | Leaf | -- | -- | * | |
| Laurus nobilis | Fruit Essent. Oil | -- | 90000.0 | * | |
| Laurus nobilis | Fruit | -- | -- | * | |
| Liquidambar styraciflua | Resin, Exudate, Sap | 50000.0 | 230000.0 | 1.0 | * |
| Liquidambar orientalis | Resin, Exudate, Sap | 20000.0 | 150000.0 | -1.0 | * |
| Lycium barbarum | Fruit | -- | -- | Leung, A. Y. and Foster, S. 1995. Encyclopedia of Common Natural Ingredients 2nd Ed. John Wiley & Sons, New York. 649 pp. | |
| Medicago sativa | Tissue Culture | -- | -- | * | |
| Melaleuca bracteata | Leaf | 40.0 | 100.0 | -1.0 | Guenther, E., The Essential Oils, 6 volumes, D. van Nostrand, New York, 1948-1952. |
| Melia azedarach | Root | -- | -- | * | |
| Melia azedarach | Leaf | -- | -- | * | |
| Melia azedarach | Fruit | -- | -- | * | |
| Myroxylon balsamum | Gum | -- | -- | * | |
| Olea europaea | Fruit | -- | -- | * | |
| Ononis spinosa | Root | -- | -- | Blaschek, W., Hansel, R., Keller, K., Reichling, J., Rimpler, H., and Schneider, G. eds. 1998. Hager's Handbuch der Pharmazeutischen Praxis, Auflage Band 2 (A-K), 909 pp., (L-Z), 858 pp. Springer-Verlag, Berlin. | |
| Origanum vulgare | Plant | -- | -- | * |