| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Rubus chingii | Fruit | -- | 12.0 | -0.1 | * |
| Rumex acetosa | Leaf | 3.0 | 30.0 | 0.1 | * |
| Salvia miltiorrhiza | Root | -- | 8.0 | -0.4 | Chen, H.C. and Lin, S.M. 1988. Determination of Mineral Elements in Certain Crude Drugs (Part 1), Kaohsiung J. Med. Sci., 4: 259-272. |
| Salvia officinalis | Leaf | 7.0 | 8.0 | -0.5 | USDA's Ag Handbook 8 and sequelae) |
| Santalum acuminatum | Fruit | 2.0 | 9.0 | -0.3 | * |
| Sassafras albidum | Stem | 0.2 | 56.0 | -0.2 | * |
| Sassafras albidum | Leaf | 1.6 | 102.0 | 2.0 | * |
| Satureja montana | Leaf | 8.0 | 9.0 | -0.5 | USDA's Ag Handbook 8 and sequelae) |
| Satureja hortensis | Leaf | 8.0 | 9.0 | -0.5 | USDA's Ag Handbook 8 and sequelae) |
| Schisandra chinensis | Fruit | 5.0 | 11.0 | -0.1 | * |
| Schizonepeta tenuifolia | Plant | -- | 23.0 | 1.0 | * |
| Scrophularia buergeriana | Root | 5.0 | 6.0 | -0.6 | * |
| Scutellaria baicalensis | Root | 13.0 | 18.0 | 0.7 | * |
| Secale cereale | Seed | 4.0 | 5.0 | -0.9 | USDA's Ag Handbook 8 and sequelae) |
| Sechium edule | Leaf | 1.8 | 10.0 | -0.5 | * |
| Senna occidentalis | Seed | -- | 15.0 | 0.0 | * |
| Senna obtusifolia | Seed | 9.0 | 32.0 | 1.6 | * |
| Sesamum indicum | Plant | 14.0 | 56.0 | 4.6 | * |
| Siegesbeckia orientalis | Plant | 9.0 | 10.0 | -0.4 | * |
| Simmondsia chinensis | Seed | -- | 10.0 | -0.4 | * |