| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Schisandra chinensis | Fruit | 0.1 | 0.7 | -0.2 | * |
| Scutellaria lateriflora | Plant | 0.1 | 0.8 | -0.4 | * |
| Senna alexandrina | Leaf | 0.3 | 1.6 | -0.3 | * |
| Senna obtusifolia | Seed | -- | -- | * | |
| Serenoa repens | Fruit | 0.3 | 2.6 | 0.3 | Pedersen, M. 1987. Nutritional Herbology. Pederson Publishing. Bountiful, Utah. 377 pp. |
| Silybum marianum | Plant | -- | 7.1 | -0.1 | Pedersen, M. 1987. Nutritional Herbology. Pederson Publishing. Bountiful, Utah. 377 pp. |
| Silybum marianum | Leaf | 2.0 | 7.1 | 0.2 | * |
| Smilax officinalis | Root | 0.7 | 3.1 | -0.1 | * |
| Smilax spp | Root | 0.7 | 3.1 | -0.1 | * |
| Solanum tuberosum | Tuber | -- | 0.01 | * | |
| Solanum melongena | Fruit | 0.001 | 0.002 | -0.4 | * |
| Sorbus aucubaria | Fruit | 0.001 | 0.011 | -0.4 | * |
| Spinacia oleracea | Leaf | -- | 0.057 | -0.4 | ACTA AGRIC SCAND SUPPL 22: 1980 |
| Spirulina spp. | Plant | -- | 1.0 | -0.4 | * |
| Stachys officinalis | Plant | 0.5 | 2.8 | -0.3 | * |
| Stellaria media | Plant | -- | 0.4 | -0.4 | * |
| Stevia rebaudiana | Leaf | -- | 25.0 | 1.5 | Pedersen, M. 1987. Nutritional Herbology. Pederson Publishing. Bountiful, Utah. 377 pp. |
| Symphoricarpos orbiculatus | Stem | 0.02 | 0.08 | -0.4 | * |
| Symphytum officinale | Leaf | 0.1 | 1.2 | -0.3 | * |
| Symphytum officinale | Root | -- | 5.7 | 0.0 | Pedersen, M. 1987. Nutritional Herbology. Pederson Publishing. Bountiful, Utah. 377 pp. |