In a Chinese study, 87 men with infertility were treated with a modification of Sheng jing zhing zu tang over 1-3 courses of treatment.  56.3%, more than half of males achieved a pregnancy, and 23% had a two-folded increase in sperm count and a significant improvement in morphology. 14% of patients had an improvement in one of the sperm paramenters.  4 cases did not respond. 

Yang, B et al ‘The therapeutic effect on Sheng jing zhing zu tang in treating male infertility’, Journal of TCM, 2001.