| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Scutellaria lateriflora | Plant | -- | 863000.0 | 0.4 | * |
| Secale cereale | Seed | 100000.0 | 110000.0 | -0.5 | * |
| Sechium edule | Shoot | -- | 926000.0 | 1.0 | * |
| Sechium edule | Leaf | -- | 823000.0 | 0.1 | * |
| Sechium edule | Fruit | 925000.0 | 930000.0 | 0.7 | * |
| Senna alexandrina | Leaf | -- | 797000.0 | -0.1 | * |
| Senna obtusifolia | Seed | 96800.0 | 97200.0 | -0.5 | * |
| Serenoa repens | Fruit | -- | 870000.0 | 0.4 | Pedersen, M. 1987. Nutritional Herbology. Pederson Publishing. Bountiful, Utah. 377 pp. |
| Sesamum indicum | Seed | 45100.0 | 50820.0 | -0.7 | USDA's Ag Handbook 8 and sequelae) |
| Sicana odorifera | Fruit | 851000.0 | 874000.0 | 0.4 | * |
| Sida rhombifolia | Leaf | -- | 802000.0 | -0.0 | * |
| Silybum marianum | Plant | -- | 882000.0 | 0.5 | Pedersen, M. 1987. Nutritional Herbology. Pederson Publishing. Bountiful, Utah. 377 pp. |
| Silybum marianum | Leaf | -- | 780000.0 | -0.1 | * |
| Simmondsia chinensis | Seed | 43000.0 | 46000.0 | -0.7 | * |
| Sinapis alba | Seed | 66450.0 | 75700.0 | -0.6 | * |
| Smilax officinalis | Root | -- | 790000.0 | 0.1 | * |
| Smilax spp | Root | -- | 790000.0 | 0.1 | * |
| Solanum tuberosum | Tuber | 700000.0 | 800000.0 | 0.1 | * |
| Solanum melongena | Leaf | -- | 864000.0 | 0.3 | * |
| Solanum sessiliflorum | Fruit | -- | 900000.0 | 0.6 | Morton, J.F., Major Medicinal Plants. 1977. Atlas of Medicinal Plants of Middle America. Bahamas to Yucatan. 1981. |