| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Chamaemelum nobile | Flower | -- | 4.3 | -0.4 | * |
| Chenopodium ambrosioides | Leaf | 3.0 | 19.0 | -0.1 | * |
| Chenopodium album | Seed | 1.0 | 2.0 | -0.6 | * |
| Chenopodium album | Leaf | 12.0 | 76.0 | 0.2 | * |
| Chondrus crispus | Plant | -- | 1.1 | -0.7 | Pedersen, M. 1987. Nutritional Herbology. Pederson Publishing. Bountiful, Utah. 377 pp. |
| Chrysanthemum coronarium | Leaf | 1.9 | 29.0 | -0.0 | * |
| Chrysanthemum coronarium | Bud | 2.2 | 30.0 | 1.0 | * |
| Chrysanthemum parthenium | Leaf | 0.5 | 2.5 | -0.2 | * |
| Chrysanthemum parthenium | Plant | -- | 2.5 | -0.6 | * |
| Chrysophyllum cainito | Fruit | 0.2 | 1.7 | -0.7 | * |
| Cicer arietinum | Seed | 2.0 | 3.0 | -0.2 | USDA's Ag Handbook 8 and sequelae) |
| Cichorium endivia | Leaf | 0.7 | 13.0 | -0.1 | * |
| Cichorium intybus | Root | -- | 2.0 | -0.5 | USDA's Ag Handbook 8 and sequelae) |
| Cichorium intybus | Leaf | 1.0 | 29.0 | -0.0 | USDA's Ag Handbook 8 and sequelae) |
| Cimicifuga racemosa | Root | 0.1 | 0.7 | -0.7 | * |
| Cinnamomum verum | Bark | -- | 1.0 | -0.7 | CRC Handbook of Medicinal Herbs and/or CRC Handbook of Proximate Analyses |
| Cinnamomum aromaticum | Bark | 1.0 | 2.0 | -0.4 | CRC Handbook of Medicinal Herbs and/or CRC Handbook of Proximate Analyses |
| Citrullus lanatus | Seed | -- | 1.0 | -1.0 | CRC Handbook of Medicinal Herbs and/or CRC Handbook of Proximate Analyses |
| Citrullus lanatus | Fruit | 2.0 | 8.0 | 0.6 | * |
| Citrus aurantium | Fruit | 1.0 | 3.0 | -0.4 | CRC Handbook of Medicinal Herbs and/or CRC Handbook of Proximate Analyses |