| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Schizonepeta tenuifolia | Plant | -- | 3390.0 | -0.2 | * |
| Scrophularia buergeriana | Root | -- | 2060.0 | -0.3 | * |
| Scutellaria lateriflora | Plant | 155.0 | 1130.0 | -0.9 | * |
| Scutellaria baicalensis | Root | 7170.0 | 7220.0 | 2.5 | * |
| Secale cereale | Seed | 1185.0 | 1740.0 | -0.5 | USDA's Ag Handbook 8 and sequelae) |
| Sechium edule | Fruit | 140.0 | 2000.0 | -0.1 | * |
| Sechium edule | Leaf | 670.0 | 3785.0 | -0.1 | * |
| Senna obtusifolia | Seed | 2820.0 | 3220.0 | 0.1 | * |
| Senna alexandrina | Leaf | 1577.0 | 7770.0 | 1.4 | * |
| Senna occidentalis | Seed | -- | 2880.0 | -0.0 | * |
| Serenoa repens | Fruit | 510.0 | 3930.0 | 0.8 | Pedersen, M. 1987. Nutritional Herbology. Pederson Publishing. Bountiful, Utah. 377 pp. |
| Sesamum indicum | Seed | 3052.0 | 4082.0 | 0.4 | USDA's Ag Handbook 8 and sequelae) |
| Siegesbeckia orientalis | Plant | -- | 2660.0 | -0.4 | * |
| Silybum marianum | Leaf | 887.0 | 4030.0 | -0.0 | * |
| Silybum marianum | Plant | -- | 4030.0 | -0.0 | Pedersen, M. 1987. Nutritional Herbology. Pederson Publishing. Bountiful, Utah. 377 pp. |
| Simmondsia chinensis | Seed | -- | 1410.0 | -0.6 | * |
| Sinapis alba | Seed | 2863.0 | 3282.0 | 0.1 | * |
| Sinomenium acutum | Rhizome | -- | 360.0 | -1.3 | * |
| Smilax spp | Root | 351.0 | 1670.0 | -0.5 | * |
| Smilax officinalis | Root | 351.0 | 1670.0 | -0.5 | * |