| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Glycine max | Seed | -- | -- | * | |
| Medicago sativa | Shoot | -- | -- | * | |
| Trifolium pratense | Root | -- | -- | * | |
| Medicago sativa | Root | -- | -- | * | |
| Medicago sativa | Leaf | -- | -- | * | |
| Medicago sativa | Plant | -- | -- | Leung, A. Y. and Foster, S. 1995. Encyclopedia of Common Natural Ingredients 2nd Ed. John Wiley & Sons, New York. 649 pp. |