| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Sambucus canadensis | Fruit | -- | -- | * | |
| Sanguisorba officinalis | Plant | -- | -- | * | |
| Sanguisorba minor | Plant | -- | -- | * | |
| Schinus terebinthifolius | Plant | -- | -- | CRC Handbook of Medicinal Herbs and/or CRC Handbook of Proximate Analyses | |
| Schinus molle | Leaf | -- | -- | * | |
| Senna occidentalis | Root | -- | -- | * | |
| Silybum marianum | Fruit | -- | -- | * | |
| Silybum marianum | Seed | -- | -- | List, P.H. and Horhammer, L., Hager's Handbuch der Pharmazeutischen Praxis, Vols. 2-6, Springer-Verlag, Berlin, 1969-1979. | |
| Solanum tuberosum | Flower | -- | -- | * | |
| Solidago gigantea | Flower | -- | -- | * | |
| Solidago virgaurea | Leaf | -- | -- | * | |
| Solidago gigantea | Leaf | -- | -- | * | |
| Sophora japonica | Plant | -- | -- | * | |
| Sorbus aucubaria | Fruit | -- | -- | * | |
| Spartium junceum | Plant | -- | -- | * | |
| Spinacia oleracea | Leaf | 1.0 | 19.0 | -0.4 | * |
| Syzygium aromaticum | Fruit | -- | -- | Leung, A. Y. and Foster, S. 1995. Encyclopedia of Common Natural Ingredients 2nd Ed. John Wiley & Sons, New York. 649 pp. | |
| Tabebuia impetiginosa | Heart Wood | -- | -- | * | |
| Tagetes minuta | Shoot | -- | -- | * | |
| Tagetes patula | Plant | -- | -- | * |