Testosterone is a male sex hormone that affects more than just sex drive. The hormone is also responsible for bone and muscle health, sperm production, and hair growth. You can lose testosterone as you age, as well as from chronic illnesses. Hypogonadism, also called low testosterone or low T, is often medically treated to prevent future health problems. Along with your doctor’s recommendations, you may consider potential testosterone-boosting foods as a natural complement to low T treatments. Two nutrients that are especially important to your diet are vitamin D and zinc.