| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Dendrobium nobile | Stem | -- | 53.0 | -1.2 | * |
| Chamaemelum nobile | Flower | -- | 52.0 | -0.2 | * |
| Brassica oleracea var. sabellica l. | Leaf | 8.0 | 50.0 | -0.4 | * |
| Viburnum opulus | Bark | -- | 49.0 | -0.3 | Pedersen, M. 1987. Nutritional Herbology. Pederson Publishing. Bountiful, Utah. 377 pp. |
| Geranium thunbergii | Plant | -- | 49.0 | -0.3 | * |
| Brassica oleracea var. botrytis l. | Flower | 1.5 | 48.0 | -0.2 | * |
| Origanum vulgare | Plant | -- | 47.0 | -0.4 | USDA's Ag Handbook 8 and sequelae) |
| Juglans nigra | Seed | 30.0 | 46.0 | -0.1 | * |
| Pinellia ternata | Tuber | 11.0 | 46.0 | -0.2 | * |
| Rheum palmatum | Rhizome | 19.0 | 46.0 | -0.5 | * |
| Phoenix dactylifera | Fruit | 3.0 | 45.0 | -0.1 | * |
| Colocasia esculenta | Leaf | -- | 45.0 | -0.4 | * |
| Brassica oleracea var. capitata l. | Leaf | 1.0 | 45.0 | -0.4 | * |
| Mentha arvensis var. piperascens | Plant | -- | 44.0 | -0.4 | Suziki, A., Morimoto, I., and Okitzu, T., Elution of Metals from Crude Drugs, Shoykugaku Zasshi 36(3):190-195. |
| Castanea dentata | Seed | 19.0 | 44.0 | -0.1 | * |
| Psophocarpus tetragonolobus | Seed | 34.0 | 44.0 | -0.1 | * |
| Panax japonicus | Rhizome | -- | 43.0 | -0.6 | * |
| Tetrapanax papyrifera | Pith | -- | 43.0 | -1.0 | * |
| Sophora angustifolia | Root | 28.0 | 42.0 | -0.0 | * |
| Magnolia denudata | Flower | -- | 42.0 | -0.2 | * |