No, bananas do not reduce testosterone. In fact, they can actually be beneficial for those looking to increase their testosterone levels. Bananas are a great source of potassium and magnesium which help regulate hormones in the body including testosterone production. They also contain bromelain which has been shown to boost libido and sexual performance in men by increasing blood flow to the genitals. increase their testosterone Additionally, bananas are rich in B vitamins which have been linked to increased energy levels and improved overall health.