| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Angelica archangelica | Root Essent. Oil | -- | -- | * | |
| Origanum majorana | Essential Oil | -- | -- | * | |
| Aloe vera | Juice | -- | -- | Yamaguchi, I., Mega, N., Sanada, H. 1993. Components of the Gel of Aloe vera (L.) Burm. F. Biosci Biotech Biochem 57(8): 1350-1352. |