Fifty infertile men were given supplements to improve their condition. There was also a control group of fifty men. The supplements improved hormone levels, but not sperm counts. The abstract says:
A total of 100 idiopathic infertile men aged 23-46 years were included in the study. Control...
Coenzyme Q10 supplementation in infertile men with low-grade varicocele: an open, uncontrolled pilot study.
Festa R, et al. Andrologia. 2014.
Many conditions associated with male infertility are inducers of oxidative stress, including varicocele. Antioxidants, such...