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| Chemical Name | Dosage | Reference |
|---|---|---|
| TESTOSTERONE | not available | Duke, 1992 * |
| THIOURACIL | not available | Jim Duke's personal files. |
| THYMOQUINONE | not available | Jim Duke's personal files. |
| TRYPTOPHAN | not available | CRC Handbook of Medicinal Herbs and/or CRC Handbook of Proximate Analyses |
| XANTHINE | not available | Duke, 1992 * |
| Plant Name | Common Name | Chemical Count | Total Parts Per Million |
|---|---|---|---|
| Rauvolfia serpentina | Indian Snakeroot; Serpentine Wood | 1 | 0 |
| Rauvolfia tetraphylla | Four-Leaf Devilpepper; Pinque-Pinque | 1 | 0 |
| Ravensara aromatica | Ravensara | 2 | 17, 450 |
| Rheum officinale | Chinese Rhubarb | 3 | 50, 025.70000076294 |
| Rheum palmatum | Chinese Rhubarb | 5 | 50, 029.5 |
| Rheum rhabarbarum | Rhubarb | 3 | 61 |
| Rhizophora mangle | Red Mangrove | 1 | 520, 000 |
| Rhododendron dauricum | Chinese Alpenrose | 3 | 0 |
| Rhododendron ferrugineum | Rusty-Leaved Alpenrose | 1 | 0 |
| Rhododendron ponticum | Pontic Alpenrose | 2 | 120, 000 |
| Rhus coriaria | Sicilian Sumac; Sumac; Tanner's Sumac | 3 | 840, 000 |
| Rhus glabra | Smooth Sumac | 1 | 270, 000 |
| Rhus toxicodendron | Poison Ivy | 3 | 0 |
| Rhynchosia minima | Burn Mouth Vine | 2 | 0 |
| Ribes nigrum | Black Currant | 6 | 455, 928 |
| Ribes rubrum | Red Currant; White Currant | 1 | 6, 604 |
| Ribes uva-crispa | Gooseberry | 3 | 22, 341 |
| Ricinus communis | Castorbean | 6 | 0 |
| Rivea corymbosa | Snakeplant | 1 | 0 |
| Robinia pseudoacacia | Black Locust | 5 | 140, 490 |