| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Myrica cerifera | Bark | 1.0 | 3.4 | -0.1 | * |
| Nepeta cataria | Plant | 2.0 | 12.3 | 0.1 | * |
| Panax ginseng | Root | 0.5 | 2.5 | -0.2 | * |
| Parthenium integrifolium | Root | 0.4 | 2.5 | -0.2 | * |
| Passiflora incarnata | Flower | -- | -- | * | |
| Petroselinum crispum | Plant | 0.001 | 0.021 | -0.4 | * |
| Phaseolus vulgaris | Fruit | 0.001 | 0.008 | -0.4 | * |
| Phaseolus vulgaris | Seed | -- | 0.01 | -0.3 | * |
| Phyllanthus emblica | Fruit | 2.4 | 12.0 | 2.6 | * |
| Pimenta dioica | Plant | -- | 0.04 | -0.4 | * |
| Pinus echinata | Shoot | 0.02 | 0.2 | 1.4 | * |
| Pistacia vera | Seed | -- | 0.1 | -0.3 | * |
| Pisum sativum | Seed | 0.001 | 0.002 | -0.3 | * |
| Plantago psyllium | Seed | 0.3 | 1.4 | -0.2 | * |
| Plantago major | Seed | 0.3 | 1.0 | -0.3 | * |
| Polygonum multiflorum | Root | -- | 74.0 | 4.9 | Pedersen, M. 1987. Nutritional Herbology. Pederson Publishing. Bountiful, Utah. 377 pp. |
| Prunus persica | Bark | -- | -- | * | |
| Prunus dulcis | Seed | 0.005 | 0.06 | -0.3 | * |
| Prunus persica | Fruit | -- | 0.003 | -0.4 | * |
| Prunus domestica | Fruit | -- | 0.013 | -0.4 | * |