Flaxseed
Flaxseed is high in heart-healthy lipids, fiber, and essential vitamins and minerals. Furthermore, some studies suggest that it may induce a drop in testosterone levels in certain individuals. This is due to the high concentration of lignans in flaxseed, which are plant components that bind to testosterone and drive it to be expelled from your body. Furthermore, flaxseed contains omega-3 fatty acids, which have been associated with a drop in testosterone.
A tiny trial of 25 men with prostate cancer found that supplementing with flaxseed and reducing total fat intake dramatically reduced testosterone levels. Similarly, a case study found that taking flaxseed supplements on a regular basis reduced testosterone levels in a 31-year-old woman with the polycystic ovarian syndrome, a disorder marked by elevated male hormones. More large-scale research, however, is required to further investigate the effects of flaxseed on testosterone levels.