Lignan also has been found to increase levels of sex hormone binding globulin and thus reduce the amount of free circulating testosterone (Adlercreutz et al, 1987, Martin et al., 1996), though such a reduction has not been observed in all studies (Low et al, 2005).

Can flaxseed decrease testosterone?

What's more, flaxseed is rich in omega-3 fatty acids, which may be linked to a decrease in testosterone as well ( 17 ). In one small study in 25 men with prostate cancer, supplementing with flaxseed and decreasing overall fat intake was shown to significantly reduce testosterone levels ( 18 ).

Can flaxseed cause erectile dysfunction?

Consumption of foods rich in phytoestrogens such as flaxseed has increased due to its chemoprotective effects, especially those related to the cardiovascular system. The flaxseed has components that can interfere with development of male reproductive system.