| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Ribes rubrum | Fruit | 2.0 | 16.0 | -0.4 | * |
| Citrus aurantium | Fruit | -- | 16.0 | -0.4 | * |
| Ribes uva-crispa | Fruit | 1.0 | 16.0 | -0.4 | * |
| Ephedra spp | Plant | -- | 8.0 | -0.4 | * |
| Rheum palmatum | Rhizome | 9.0 | 10.0 | -0.4 | * |
| Rehmannia glutinosa | Root | -- | 14.0 | -0.4 | * |
| Sophora subprostrata | Root | -- | 14.0 | -0.4 | * |
| Polygonum multiflorum | Rhizome | -- | 8.0 | -0.4 | Chen, H.C. and Lin, S.M. 1988. Determination of Mineral Elements in Certain Crude Drugs (Part 1), Kaohsiung J. Med. Sci., 4: 259-272. |
| Phoenix dactylifera | Seed | 0.6 | 29.0 | -0.5 | Abstract (See species file) |
| Raphanus sativus | Seed | -- | 29.0 | -0.5 | * |
| Rosa laevigata | Fruit | -- | 15.0 | -0.5 | * |
| Annona cherimola | Fruit | 3.0 | 15.0 | -0.5 | * |
| Spirulina spp. | Plant | -- | 5.3 | -0.5 | * |
| Stellaria media | Plant | 0.4 | 5.2 | -0.5 | * |
| Albizia julibrissin | Bark | 7.0 | 8.0 | -0.5 | * |
| Anthriscus cerefolium | Leaf | 9.0 | 10.0 | -0.5 | * |
| Phytelephas aequatorialis | Flower | 7.0 | 24.0 | -0.5 | KOZIOL & PEDERSEN. 1993. PHYTELEPHAS AEQUATORIALIS(ARECACEAE) IN HUMAN AND ANIMAL NUTRITION. ECON. BOT. 47:401-307. |
| Euphrasia officinalis | Plant | 0.5 | 3.5 | -0.5 | * |
| Silybum marianum | Plant | -- | 3.3 | -0.5 | Pedersen, M. 1987. Nutritional Herbology. Pederson Publishing. Bountiful, Utah. 377 pp. |
| Colocasia esculenta | Leaf | -- | 6.6 | -0.5 | * |