| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Aframomum melegueta | Seed | -- | -- | Wealth of India. | |
| Vanilla planifolia | Fruit | -- | 46.0 | * | |
| Zingiber officinale | Essential Oil | -- | -- | * | |
| Zingiber officinale | Rhizome | -- | -- | * | |
| Zingiber officinale | Root Essent. Oil | -- | -- | * | |
| Zingiber officinale | Rhizome Essent. Oil | -- | -- | * |