Fenugreek
Fenugreek (Trigonella foenum-graecum) is a herb that tastes similar to maple syrup and is used in cooking and as herbal medicine. Fenugreek is said to have health benefits like weight loss, reduced risk of diabetes,, lowering inflammation, and supporting reproductive health. 
One small study that assessed the effects of fenugreek extract on testosterone levels found free testosterone increased by 46% in a large number of participants. Some of the participants experienced improved sperm morphology (shape) and production..A research review also found that fenugreek extract may be effective in increasing total testosterone levels in the blood