| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Rubus chamaemorus | Fruit | 320.0 | 2500.0 | -0.2 | * |
| Rubus idaeus | Fruit | 110.0 | 955.0 | -0.7 | Revised USDA data received 1993. |
| Rumex crispus | Root | 1945.0 | 7570.0 | 0.7 | * |
| Rumex crispus | Leaf | 560.0 | 7568.0 | 0.5 | ANON. 1948-1976. The Wealth of India raw materials. Publications and Information Directorate, CSIR, New Delhi. 11 volumes. |
| Ruscus aculeatus | Root | 504.0 | 1670.0 | -0.3 | * |
| Salix alba | Bark | 689.0 | 4100.0 | 2.4 | * |
| Salvia officinalis | Leaf | 201.0 | 1280.0 | -0.7 | * |
| Sambucus nigra | Fruit | 540.0 | 3300.0 | 0.0 | * |
| Sambucus canadensis | Fruit | 369.0 | 2036.0 | -0.4 | USDA's Ag Handbook 8 and sequelae) |
| Sassafras albidum | Leaf | 396.0 | 3264.0 | -0.3 | * |
| Sassafras albidum | Stem | 132.0 | 1776.0 | -0.5 | * |
| Satureja hortensis | Plant | -- | 1538.0 | -1.0 | CRC Handbook of Medicinal Herbs and/or CRC Handbook of Proximate Analyses |
| Schisandra chinensis | Fruit | 639.0 | 4260.0 | 0.3 | * |
| Sclerocarya caffra | Seed | 190.0 | 2290.0 | -0.8 | * |
| Scutellaria lateriflora | Plant | 248.0 | 1810.0 | -0.9 | * |
| Secale cereale | Seed | 3725.0 | 4225.0 | -0.3 | * |
| Secale cereale | Leaf | -- | 1970.0 | -0.6 | ANON. 1948-1976. The Wealth of India raw materials. Publications and Information Directorate, CSIR, New Delhi. 11 volumes. |
| Sechium edule | Shoot | 470.0 | 6350.0 | 1.3 | * |
| Sechium edule | Fruit | 260.0 | 3715.0 | 0.2 | * |
| Senna alexandrina | Leaf | 276.0 | 1360.0 | -0.7 | * |