| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Tabebuia heptaphylla | Bark | -- | 0.2 | -0.6 | * |
| Tanacetum parthenium | Plant | -- | 1.7 | -0.4 | Pedersen, M. 1987. Nutritional Herbology. Pederson Publishing. Bountiful, Utah. 377 pp. |
| Taraxacum officinale | Root | 0.1 | 0.9 | -0.3 | * |
| Thymus vulgaris | Leaf | -- | 16.0 | 0.8 | Pedersen, M. 1987. Nutritional Herbology. Pederson Publishing. Bountiful, Utah. 377 pp. |
| Trifolium pratense | Flower | 0.1 | 0.8 | -0.7 | * |
| Trifolium pratense | Stem | -- | 0.018 | -0.4 | * |
| Trifolium pratense | Leaf | -- | 0.024 | -0.4 | * |
| Trigonella foenum-graecum | Seed | 0.2 | 1.6 | -0.2 | * |
| Turnera diffusa | Leaf | 0.2 | 0.7 | -0.3 | * |
| Ulmus rubra | Bark | 0.3 | 1.5 | -0.4 | * |
| Urtica dioica | Plant | -- | -- | * | |
| Urtica dioica | Leaf | 0.4 | 2.2 | -0.2 | * |
| Vaccinium macrocarpon | Fruit | -- | 0.002 | -0.4 | ACTA AGRIC SCAND SUPPL 22: 1980 |
| Vaccinium vitis-idaea | Fruit | -- | 0.013 | -0.4 | * |
| Vaccinium myrtillus | Fruit | 0.2 | 2.8 | 0.3 | * |
| Valeriana officinalis | Root | 0.5 | 4.4 | -0.0 | * |
| Verbascum thapsus | Leaf | 0.2 | 0.5 | -0.3 | * |
| Viburnum opulus | Bark | -- | 23.0 | 2.6 | Pedersen, M. 1987. Nutritional Herbology. Pederson Publishing. Bountiful, Utah. 377 pp. |
| Vigna unguiculata | Seed | 0.014 | 0.14 | -0.3 | * |
| Vigna unguiculata | Seed | 0.014 | 0.14 | -0.3 | * |