Table 2
Minimum inhibitory concentration (MIC) of Polygonum multiflorum and Cynanchi wilfordii root extracts against P. acnes and S. aureus
| Bacteria | Extract | MIC (mg/mL) |
| P. multiflorum | C. wilfordii |
| Propionibacterium acnes | Water | >1.0 | >1.0 |
| Ethanol | 0.8 | 1.0 |
| Butanol | >1.0 | >1.0 |
| Staphylococcus aureus | Water | >1.0 | >1.0 |
| Ethanol | 0.8 | 1.0 |
| Butanol | >1.0 | >1.0 |