| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Thymus vulgaris | Leaf | 15.0 | 1462.0 | 1.3 | * |
| Valeriana officinalis | Leaf | 5.0 | 3900.0 | 4.4 | Father Nature's Farmacy: The aggregate of all these three-letter citations. |
| Valeriana officinalis | Leaf Essent. Oil | 18200.0 | 153000.0 | 1.4 | * |
| Valeriana officinalis | Essential Oil | -- | -- | * | |
| Valeriana officinalis | Root | 5.0 | 460.0 | * | |
| Valeriana officinalis | Root Essent. Oil | -- | -- | * | |
| Zingiber officinale | Rhizome Essent. Oil | -- | 18000.0 | * | |
| Zingiber officinale | Rhizome | -- | 180.0 | * |