| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Morus alba | Leaf | -- | -- | * | |
| Melissa officinalis | Shoot | -- | -- | * | |
| Melaleuca leucadendra | Plant | -- | -- | * | |
| Marrubium vulgare | Shoot | -- | -- | * | |
| Malus domestica | Fruit | -- | -- | * | |
| Malus domestica | Pericarp | -- | -- | * | |
| Malus domestica | Fruit Juice | -- | -- | * | |
| Lycopodium selago | Plant | -- | -- | * | |
| Lycium chinense | Leaf | -- | -- | Hansel, R., Keller, K., Rimpler, H., and Schneider, G. eds. 1992. Hager's Handbuch der Pharmazeutischen Praxis, Drogen (A-D), 1209 pp., 1993 (E-O), 970 pp., 1994 (P-Z), 1196 pp. Springer-Verlag, Berlin. | |
| Leonurus cardiaca | 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. | |
| Laurus nobilis | Leaf | -- | -- | * | |
| Juniperus communis | Fruit | -- | -- | * | |
| Juniperus communis | Leaf | -- | -- | * | |
| Ipomoea batatas | Root | -- | -- | * | |
| Hypericum perforatum | Flower | -- | -- | * | |
| Hypericum perforatum | Plant | -- | 3000.0 | 1.0 | * |
| Humulus lupulus | Fruit | -- | -- | CRC Handbook of Medicinal Herbs and/or CRC Handbook of Proximate Analyses | |
| Houttuynia cordata | Leaf | -- | -- | * | |
| Houttuynia cordata | Plant | -- | -- | Chemical Constituents of Oriental Herbs (3 diff. books) | |
| Houttuynia cordata | Shoot | -- | 700.0 | 1.4 | * |