With testosterone levels on the decline, its essential for any man who’s looking to maintain testosterone levels, particularly as he ages, the he feeds his body with the key, essential vitamins & minerals. And this is where zinc, vitamin D & magnesium come in, as these 3 nutrients have all be shown to help maintain & support testosterone levels. Real, whole foods as the primary sources of zinc & magnesium … and healthy sun exposure for vitamin D should always be the first choice. But sometimes,