| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Allium sativum var. sativum | Bulb | -- | -- | * | |
| Cucumis sativus | Seed | -- | -- | * | |
| Glycine max | Sprout Seedling | -- | -- | * | |
| Panax ginseng | Root | -- | -- | * | |
| Zingiber officinale | Root | -- | -- | Leung, A.Y., Encyclopedia of Common Natural Ingredients Used in Food, Drugs, and Cosmetics, John Wiley & Sons, New York, 1980. | |
| Zingiber officinale | Rhizome | -- | -- | * |