| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Triticum aestivum | Plant | -- | -- | * | |
| Tussilago farfara | Leaf | -- | -- | * | |
| Uncaria catechu | Bulb | -- | -- | * | |
| Urginea maritima | Bulb | -- | -- | * | |
| Urtica dioica | Inflorescence | -- | -- | Jim Duke's personal files. | |
| Urtica dioica | Plant | -- | -- | Newall, C. A., Anderson, L. A. and Phillipson, J. D. 1996. Herbal Medicine - A Guide for Health-care Professionals. The Pharmaceutical Press, London. 296pp. | |
| Vaccinium myrtillus | Leaf | -- | -- | * | |
| Vaccinium macrocarpon | Fruit | 100.0 | 250.0 | 0.5 | * |
| Vaccinium corymbosum | Plant | -- | -- | * | |
| Vaccinium vitis-idaea | Leaf | -- | -- | * | |
| Valeriana officinalis | Plant | -- | -- | * | |
| Viburnum opulus | Leaf | -- | -- | * | |
| Vigna radiata | Sprout Seedling | -- | -- | * | |
| Viola odorata | Plant | -- | -- | * | |
| Viola tricolor | Flower | -- | -- | * | |
| Vitis vinifera | Leaf | -- | -- | * | |
| Vitis vinifera | Fruit | 0.5 | 16.0 | -0.7 | * |
| Withania somnifera | Leaf | -- | -- | * | |
| Zea mays | Plant | -- | -- | * | |
| Zea mays | Pollen Or Spore | -- | -- | * |