| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Humulus lupulus | Stem | -- | -- | * | |
| Abelmoschus moschatus | Seed | -- | -- | Leung, A. Y. and Foster, S. 1995. Encyclopedia of Common Natural Ingredients 2nd Ed. John Wiley & Sons, New York. 649 pp. | |
| Ceratonia siliqua | Seed | -- | -- | Wealth of India. | |
| Teucrium chamaedrys | Plant | -- | -- | Abstract (See species file) | |
| Echinacea angustifolia | Root | -- | -- | Leung, A. Y. and Foster, S. 1995. Encyclopedia of Common Natural Ingredients 2nd Ed. John Wiley & Sons, New York. 649 pp. | |
| Sambucus canadensis | Plant | -- | -- | J.S. Glasby Dict.Pls Containing 2ndary Metabolite. 1991. |