| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Citrus paradisi | Seed | -- | -- | CRC Handbook of Medicinal Herbs and/or CRC Handbook of Proximate Analyses | |
| Citrus reticulata | Seed | -- | -- | * | |
| Citrus sinensis | Seed | -- | -- | Jim Duke's personal files. | |
| Citrus limon | Seed | -- | -- | Jim Duke's personal files. | |
| Casimiroa edulis | Plant | -- | -- | Morton, J.F., Major Medicinal Plants. 1977. Atlas of Medicinal Plants of Middle America. Bahamas to Yucatan. 1981. |