| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Aesculus hippocastanum | Leaf | -- | -- | Jim Duke's personal files. | |
| Aglaonema commutatum | Fruit | -- | -- | Wealth of India. | |
| Asparagus officinalis | Plant | -- | -- | * | |
| Balanites aegyptiacus | Seed | -- | -- | * | |
| Brassica oleracea var. botrytis l. | Plant | -- | -- | * | |
| Brassica oleracea var. italica | Plant | -- | -- | Jim Duke's personal files. | |
| Capsicum frutescens | Fruit | -- | -- | * | |
| Capsicum annuum | Fruit | 0.2 | 20.0 | 2.4 | * |
| Citrus reticulata | Fruit | 0.2 | 2.0 | -0.3 | * |
| Citrus paradisi | Fruit | -- | -- | -0.6 | * |
| Citrus sinensis | Pericarp | -- | -- | Jim Duke's personal files. | |
| Citrus sinensis | Fruit | 0.19 | 1.9 | -0.3 | * |
| Cucumis melo | Fruit | -- | -- | * | |
| Daucus carota | Root | 17.0 | 25.0 | * | |
| Equisetum arvense | Sprout Seedling | -- | -- | Jim Duke's personal files. | |
| Eriobotrya japonica | Fruit | -- | -- | Jim Duke's personal files. | |
| Ginkgo biloba | Tissue Culture | -- | -- | Jim Duke's personal files. | |
| Iris x germanica | Leaf | -- | -- | * | |
| Lachnanthes tinctoria | Fruit | -- | -- | * | |
| Mentha x piperita | Leaf | -- | -- | Leung, A. Y. and Foster, S. 1995. Encyclopedia of Common Natural Ingredients 2nd Ed. John Wiley & Sons, New York. 649 pp. |