| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Cnicus benedictus | Plant | -- | -- | Jim Duke's personal files. | |
| Punica granatum | Plant | -- | -- | * | |
| Dipsacus fullonum | Plant | -- | -- | List, P.H. and Horhammer, L., Hager's Handbuch der Pharmazeutischen Praxis, Vols. 2-6, Springer-Verlag, Berlin, 1969-1979. | |
| Rosmarinus officinalis | Plant | -- | -- | Leung, A.Y., Encyclopedia of Common Natural Ingredients Used in Food, Drugs, and Cosmetics, John Wiley & Sons, New York, 1980. | |
| Cimicifuga dahurica | Rhizome | -- | -- | * | |
| Senna obtusifolia | Seed | -- | -- | * | |
| Dodonaea viscosa | Plant | -- | -- | * | |
| Vaccinium myrtillus | Fruit | -- | -- | * | |
| Vaccinium myrtillus | Fruit Juice | -- | -- | * | |
| Allium cepa | Bulb | -- | -- | * | |
| Ipomoea batatas | Root | -- | -- | * | |
| Centaurium erythraea | Plant | -- | -- | * | |
| Astragalus membranaceus | Root | -- | -- | Leung, A. Y. and Foster, S. 1995. Encyclopedia of Common Natural Ingredients 2nd Ed. John Wiley & Sons, New York. 649 pp. | |
| Trifolium pratense | Leaf | -- | -- | * | |
| Ananas comosus | Fruit | -- | -- | Wealth of India. | |
| Origanum majorana | Shoot | -- | -- | * | |
| Solanum torvum | Plant | -- | -- | * | |
| Artemisia dracunculus | Shoot | -- | -- | * | |
| Stellaria media | Shoot | -- | -- | * | |
| Cynara cardunculus | Flower | -- | -- | * |