| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Citrullus lanatus | Fruit | -- | 4594.0 | -0.7 | Leung, A. Y. and Foster, S. 1995. Encyclopedia of Common Natural Ingredients 2nd Ed. John Wiley & Sons, New York. 649 pp. |
| Citrus paradisi | Fruit | 810.0 | 4700.0 | -0.7 | * |
| Citrus sinensis | Fruit | 70.0 | 8607.0 | -0.2 | * |
| Citrus reticulata | Fruit | 240.0 | 6206.0 | -0.5 | * |
| Cnidoscolus chayamansa | Leaf | 8495.0 | 42470.0 | 1.0 | * |
| Cocos nucifera | Seed | 3250.0 | 6130.0 | -1.5 | USDA's Ag Handbook 8 and sequelae) |
| Cocos nucifera | Leaf | -- | -- | Jim Duke's personal files. | |
| Cocos nucifera | Endosperm | -- | -- | Jim Duke's personal files. | |
| Coffea arabica | Seed | -- | -- | * | |
| Colocasia esculenta | Root | 1920.0 | 6540.0 | -0.4 | * |
| Corchorus olitorius | Leaf | 5670.0 | 46150.0 | 1.2 | * |
| Coriandrum sativum | Fruit | -- | -- | * | |
| Crocus sativus | Bulb | -- | -- | * | |
| Cryptotaenia japonica | Root | -- | -- | * | |
| Cryptotaenia japonica | Shoot | -- | -- | * | |
| Cucumis sativus | Fruit | 320.0 | 8101.0 | -0.3 | * |
| Cucurbita pepo | Fruit | 1020.0 | 12143.0 | 0.3 | USDA's Ag Handbook 8 and sequelae) |
| Cucurbita foetidissima | Seed | 29165.0 | 37280.0 | 1.3 | * |
| Cucurbita spp | Fruit | 1440.0 | 22785.0 | 1.7 | * |
| Cucurbita pepo | Seed | 24770.0 | 41080.0 | 1.6 | * |