| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Calendula officinalis | Flower | 1330.0 | 3100.0 | 0.1 | * |
| Camellia sinensis | Leaf | -- | -- | * | |
| Canavalia ensiformis | Fruit | 320.0 | 1488.0 | -0.2 | * |
| Canavalia ensiformis | Seed | -- | 23.0 | -0.3 | * |
| Canna indica | Root | 70.0 | 210.0 | -0.5 | * |
| Cannabis sativa | Seed | -- | -- | -0.3 | CRC Handbook of Medicinal Herbs and/or CRC Handbook of Proximate Analyses |
| Capparis spinosa | Fruit | -- | 1335.0 | -0.2 | Wealth of India. |
| Capparis spinosa | Leaf | -- | 710.0 | -0.4 | Wealth of India. |
| Capparis spinosa | Flower | 260.0 | 2300.0 | -0.1 | * |
| Capsella bursa-pastoris | Plant | 360.0 | 5500.0 | 0.7 | * |
| Capsicum annuum | Fruit | 230.0 | 20982.0 | 1.0 | * |
| Capsicum frutescens | Fruit | 350.0 | 23000.0 | 1.1 | * |
| Carica papaya | Leaf | 1400.0 | 6222.0 | 0.1 | * |
| Carica papaya | Fruit | 640.0 | 4741.0 | 0.0 | * |
| Carica pentagona | Fruit | 290.0 | 4265.0 | -0.0 | CRC Handbook of Medicinal Herbs and/or CRC Handbook of Proximate Analyses |
| Carthamus tinctorius | Flower | 14.0 | 100.0 | -0.8 | * |
| Carthamus tinctorius | Seed | -- | -- | -0.3 | * |
| Carya illinoensis | Seed | 20.0 | 21.0 | -0.3 | * |
| Casimiroa edulis | Fruit | 230.0 | 1395.0 | -0.2 | * |
| Catha edulis | Leaf | -- | 1610.0 | -0.3 | * |