| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Prunus persica | Hh | -- | 10.0 | * | |
| Psidium guajava | Fruit | -- | 140.0 | -0.3 | ANON. 1948-1976. The Wealth of India raw materials. Publications and Information Directorate, CSIR, New Delhi. 11 volumes. |
| Punica granatum | Fruit | -- | 140.0 | -0.3 | * |
| Raphanus sativus | Root | -- | 92.0 | -0.6 | * |
| Rheum officinale | Rhizome | -- | -- | * | |
| Rheum rhabarbarum | Pt | 4400.0 | 13360.0 | * | |
| Rheum rhabarbarum | Leaf | 3000.0 | 11000.0 | -0.2 | * |
| Ribes uva-crispa | Fruit | -- | -- | * | |
| Ribes rubrum | Fruit | -- | -- | * | |
| Ribes nigrum | Fruit | -- | 200.0 | -0.3 | * |
| Rubus fruticosus | Leaf | -- | -- | * | |
| Rumex acetosella | Plant | -- | -- | * | |
| Rumex acetosa | Leaf | -- | 3000.0 | -0.4 | * |
| Rumex crispus | Leaf | 5170.0 | 6970.0 | -0.3 | * |
| Rumex crispus | Root | -- | -- | Pedersen, M. 1987. Nutritional Herbology. Pederson Publishing. Bountiful, Utah. 377 pp. | |
| Salvia officinalis | Plant | -- | -- | * | |
| Sambucus nigra | Fruit | -- | 410.0 | -0.3 | * |
| Sechium edule | Fruit | -- | 340.0 | -0.3 | * |
| Sesamum indicum | Seed | -- | -- | * | |
| Sinapis alba | Seed | -- | -- | * |