A formula called Niu che shen qi wan was tested in Japan for its effectiveness on male infertility.  Patients were given the formulae for at least three months.  50% of patients showed a significant increase in sperm motility.  About 30% showed an increase in sperm count. 

Takayama H, Konishi T, Kounami T, Wakabayashi Y, Watanabe J, Hayashida H, Tomoyoshi T. ‘Clinical effects of goshajinkigan for male infertility’ Hinyokika Kiyo. 1984 Nov; 30(11):1685-9.