Brazil nuts will help boost testosterone levels due to the Selenium contained in the Brazil nuts.
In addition to the Selenium in Brazil nuts boosting men's testosterone levels it can also help boosts a mans sperm count and improve a mans fertility.
So if your sperm count is low you should try some Brazil nuts for both boosting testosterone levels as well as increasing sperm count.
Brazil nuts are also an antioxidant which can detox your body of other harmful things and are good for your overall health.
Just don't eat more than 6 Brazil nuts per day otherwise you risk radiation poisoning which is not good at all.