| Year published | 1998 |
| Literatures (Research papers) |
Kamei T, Kumano H, Beppu K, Iwata K, Masumura S: Response of healthy individuals to ninjin-yoei-to extract--enhancement of natural killer cell activity. Am J Chin Med 26(1):91-95, 1998. |
| Kampo formulas | ninjin'yoeito |
| Remarks | ninjin'yoeito |