| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Cinnamomum aromaticum | Bark | -- | 309.0 | 0.1 | CRC Handbook of Medicinal Herbs and/or CRC Handbook of Proximate Analyses |
| Citrullus colocynthis | Fruit | -- | 122.0 | -0.3 | * |
| Citrullus lanatus | Fruit | -- | 94.0 | -0.3 | * |
| Citrus reticulata | Fruit | 280.0 | 3684.0 | -0.1 | * |
| Citrus aurantium | Leaf | -- | 3000.0 | -0.2 | Watt, J.M. and Breyer-Brandwijk, M.G. 1962. The Medicinal and Poisonous Plants of Southern and Eastern Africa. E. & S. Livingstone, Ltd. Edinburg & London. 1457 pp. |
| Citrus mitis | Fruit | 884.0 | 11130.0 | 0.4 | * |
| Citrus paradisi | Fruit | 337.0 | 3862.0 | -0.0 | * |
| Citrus limon | Fruit | 5208.0 | 5566.0 | 0.1 | * |
| Citrus aurantium | Fruit | 420.0 | 3947.0 | -0.0 | CRC Handbook of Medicinal Herbs and/or CRC Handbook of Proximate Analyses |
| Citrus mitis | Fruit Juice | 300.0 | 445.0 | 1.0 | * |
| Citrus limon | Fruit Juice | -- | -- | Jim Duke's personal files. | |
| Citrus sinensis | Fruit | 500.0 | 4071.0 | -0.0 | * |
| Citrus aurantiifolia | Fruit | 291.0 | 4444.0 | -0.0 | * |
| Cnicus benedictus | Plant | 4.0 | 30.0 | -0.6 | * |
| Cnidoscolus chayamansa | Leaf | 1960.0 | 12200.0 | 0.7 | * |
| Coccinia grandis | Fruit | 280.0 | 4058.0 | -0.0 | ANON. 1948-1976. The Wealth of India raw materials. Publications and Information Directorate, CSIR, New Delhi. 11 volumes. |
| Cocos nucifera | Seed | 20.0 | 88.0 | -0.3 | CRC Handbook of Medicinal Herbs and/or CRC Handbook of Proximate Analyses |
| Coix lacryma-jobi | Seed | -- | -- | -0.3 | CRC Handbook of Medicinal Herbs and/or CRC Handbook of Proximate Analyses |
| Cola acuminata | Seed | 540.0 | 1456.0 | 0.5 | * |
| Colocasia esculenta | Root | -- | 325.0 | -0.5 | * |