| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Psoralea esculenta | Root | -- | 1899.0 | -0.2 | Izadoost, M. & Robinson, T., Synergism & antagonism in the pharmacology of alkaloidal plants, pp 137-58 in Craker, L. & Simon, J., eds., Herbs, Spices & Medicinal Plants: Recent Advances in Botany, Horticulture & Pharmacology, v. 2, 1987, 255pp. |
| Pyrus communis | Fruit | 30.0 | 185.0 | -0.9 | * |
| Raphanus sativus | Root | 130.0 | 2520.0 | 0.8 | * |
| Rehmannia glutinosa | Root | 1000.0 | 3000.0 | 1.6 | * |
| Rosmarinus officinalis | Leaf | 1000.0 | 3100.0 | -1.4 | USDA's Ag Handbook 8 and sequelae) |
| Salvia officinalis | Plant | -- | -- | Stitt, Paul. Why George should eat broccoli. | |
| Sambucus nigra | Fruit | 2200.0 | 2900.0 | 0.2 | * |
| Sambucus nigra | Fruit Juice | -- | -- | * | |
| Sambucus canadensis | Fruit | 510.0 | 2524.0 | 0.0 | USDA's Ag Handbook 8 and sequelae) |
| Secale cereale | Seed | 3390.0 | 3800.0 | -0.9 | USDA's Ag Handbook 8 and sequelae) |
| Sechium edule | Fruit | 350.0 | 5000.0 | 1.1 | * |
| Senna obtusifolia | Seed | -- | 4420.0 | -0.8 | * |
| Sesamum indicum | Seed | 4220.0 | 11818.0 | 0.9 | * |
| Sinapis alba | Seed | 7440.0 | 7961.0 | 0.1 | * |
| Solanum tuberosum | Tuber | 770.0 | 3900.0 | -0.0 | * |
| Solanum melongena | Fruit | 250.0 | 3593.0 | 0.5 | * |
| Spinacia oleracea | Plant | 1080.0 | 12826.0 | 1.7 | USDA's Ag Handbook 8 and sequelae) |
| Stachys officinalis | Shoot | -- | -- | * | |
| Theobroma cacao | Seed | -- | 5700.0 | -0.5 | ANON. 1948-1976. The Wealth of India raw materials. Publications and Information Directorate, CSIR, New Delhi. 11 volumes. |
| Thymus vulgaris | Plant | 2410.0 | 2603.0 | -0.8 | USDA's Ag Handbook 8 and sequelae) |