| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Cichorium intybus | Shoot | -- | -- | * | |
| Pimpinella anisum | Plant | -- | -- | * | |
| Cichorium intybus | Leaf | -- | -- | * | |
| Hordeum vulgare | Fruit | -- | -- | * | |
| Brassica oleracea var. botrytis l. | Leaf | -- | -- | * | |
| Prunus cerasus | Fruit | -- | -- | * | |
| Hydrastis canadensis | Root | -- | -- | Leung, A. Y. and Foster, S. 1995. Encyclopedia of Common Natural Ingredients 2nd Ed. John Wiley & Sons, New York. 649 pp. | |
| Cydonia oblonga | Fruit | -- | -- | * | |
| Berberis vulgaris | Fruit | -- | -- | Jim Duke's personal files. | |
| Artemisia abrotanum | Plant | -- | -- | * | |
| Stachys officinalis | Plant | -- | -- | CRC Handbook of Medicinal Herbs and/or CRC Handbook of Proximate Analyses | |
| Apium graveolens | Seed | -- | -- | Wealth of India. | |
| Scopolia carniolica | Leaf | -- | -- | * | |
| Teucrium scordium | Plant | -- | -- | ANON. 1948-1976. The Wealth of India raw materials. Publications and Information Directorate, CSIR, New Delhi. 11 volumes. | |
| Brassica oleracea var. capitata l. | Plant | -- | -- | * | |
| Crataegus laevigata | Plant | -- | -- | * | |
| Physalis peruviana | Leaf | -- | -- | * | |
| Pluchea carolinensis | Shoot | -- | -- | Tramil | |
| Thymus vulgaris | Shoot | -- | -- | * | |
| Fragaria spp | Fruit | -- | -- | Jim Duke's personal files. |