| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Curcuma longa | Rhizome Essent. Oil | -- | 240700.0 | * | |
| Curcuma longa | Rhizome | 1800.0 | 43200.0 | * | |
| Curcuma longa | Root | -- | -- | * | |
| Curcuma xanthorrhiza | Rhizome | -- | -- | List, P.H. and Horhammer, L., Hager's Handbuch der Pharmazeutischen Praxis, Vols. 2-6, Springer-Verlag, Berlin, 1969-1979. |