| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Cocos nucifera | Leaf | -- | -- | Jim Duke's personal files. | |
| Colocasia esculenta | Root | 740.0 | 2520.0 | -0.2 | * |
| Corchorus olitorius | Leaf | 2140.0 | 17420.0 | 1.9 | * |
| Coriandrum sativum | Fruit | -- | -- | * | |
| Crocus sativus | Bulb | -- | -- | * | |
| Cryptotaenia japonica | Root | -- | -- | * | |
| Cucumis sativus | Fruit | 190.0 | 4810.0 | 0.5 | * |
| Cucurbita pepo | Fruit | 270.0 | 8000.0 | 1.7 | * |
| Cucurbita spp | Fruit | 440.0 | 6962.0 | 1.3 | * |
| Cucurbita foetidissima | Seed | 14735.0 | 27700.0 | 2.4 | * |
| Cucurbita pepo | Seed | 17960.0 | 39220.0 | 4.1 | * |
| Daucus carota | Root | 300.0 | 2455.0 | -0.2 | * |
| Dioscorea pentaphylla | Root | 460.0 | 2480.0 | -0.2 | * |
| Echinacea purpurea | Plant | -- | -- | Leung, A. Y. and Foster, S. 1995. Encyclopedia of Common Natural Ingredients 2nd Ed. John Wiley & Sons, New York. 649 pp. | |
| Fagopyrum esculentum | Seed | -- | 9750.0 | -0.2 | * |
| Ficus carica | Fruit | 250.0 | 1197.0 | -0.9 | USDA's Ag Handbook 8 and sequelae) |
| Foeniculum vulgare | Seed | 11070.0 | 12144.0 | 0.2 | USDA's Ag Handbook 8 and sequelae) |
| Foeniculum vulgare | Fruit | 11070.0 | 12144.0 | 3.3 | * |
| Fragaria spp | Fruit | 240.0 | 2847.0 | -0.3 | USDA's Ag Handbook 8 and sequelae) |
| Ginkgo biloba | Seed | 2320.0 | 6325.0 | -0.7 | USDA's Ag Handbook 8 and sequelae) |