A long list of supplements are marketed as testosterone boosters, but there is scant evidence to suggest that any of them affect testosterone levels.[1][2] Some of the more popular options include saw-palmetto, ashwagandha, tribulus-terrestris, fenugreek, d-aspartic-acid, maca, horny-goat-weed, and boron.
Supplementing with certain nutrients such as vitamin D, zinc, and magnesium can slightly increase testosterone levels if dietary intake and serum levels are inadequate.[3]