Onions are great not just at building testosterone, but also at keeping your immune system in top shape. Onions are packed with anti-inflammatory phytochemicals and antioxidants. Onions also have a few testosterone boosting compounds - such as apigenin and quercetin. There are several different rodent studies that show that onions had an androgenic effect. One of the best studies on the subject was a study where onion juice was added to the male rodent's feed - the juice increased the rodent's testosterone by over 300%. That is three times over the normal values.
