There are only a few natural testosterone boosters are supported by scientific studies.
The herb with the most research behind it is called ashwagandha.
One study tested the effects of ashwagandha infertile men and found a 17% increase in testosterone levels and a 167% increase in sperm count. In healthy men, ashwagandha increased levels by 15%. Another study found it lowered cortisol by around 25%, which may also aid testosterone.
- Complementary Therapies