| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Brassica oleracea var. botrytis l. | Leaf | -- | -- | * | |
| Calea zacatechichi | Plant | -- | -- | * | |
| Calendula officinalis | Plant | -- | 0.34 | -0.7 | * |
| Camellia sinensis | Leaf | -- | -- | * | |
| Cananga odorata | Flower | -- | -- | * | |
| Centaurea cyanus | Flower | -- | -- | Jim Duke's personal files. | |
| Cimicifuga racemosa | Plant | -- | -- | Pedersen, M. 1987. Nutritional Herbology. Pederson Publishing. Bountiful, Utah. 377 pp. | |
| Cinnamomum aromaticum | Plant | -- | -- | * | |
| Colchicum autumnale | Plant | -- | -- | * | |
| Cucurbita pepo | Seed | -- | -- | ANON. 1948-1976. The Wealth of India raw materials. Publications and Information Directorate, CSIR, New Delhi. 11 volumes. | |
| Dipteryx odorata | Leaf | -- | -- | Grenand, P., Moretti, C., and Jacquemin, H. 1987. Pharmacopees Traditionnelles en Guyane. l'ORSTROM, Paris. 569 pp. | |
| Filipendula ulmaria | Flower | -- | -- | * | |
| Filipendula ulmaria | Stem | -- | 16.0 | * | |
| Fragaria spp | Fruit | -- | -- | Jim Duke's personal files. | |
| Gloriosa superba | Bulb | -- | -- | * | |
| Glycine max | Seed | -- | -- | * | |
| Glycyrrhiza glabra | Rhizome | -- | 567.0 | * | |
| Glycyrrhiza glabra | Root | -- | 567.0 | 1.0 | * |
| Gossypium sp | Root | -- | -- | * | |
| Hedeoma pulegioides | Plant | -- | -- | * |