| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Uncaria guianensis | Stem Bark | -- | -- | Blaschek, W., Hansel, R., Keller, K., Reichling, J., Rimpler, H., and Schneider, G. eds. 1998. Hager's Handbuch der Pharmazeutischen Praxis, Auflage Band 2 (A-K), 909 pp., (L-Z), 858 pp. Springer-Verlag, Berlin. | |
| Uncaria tomentosa | Leaf | -- | 22200.0 | * | |
| Uncaria tomentosa | Root | 45.5 | 21600.0 | * | |
| Uncaria guianensis | Leaf | -- | -- | * | |
| Uncaria tomentosa | Root Bark | -- | -- | * |