Studies have shown that nettle root extract can help to increase levels of testosterone in the body. Nettle root extract works by inhibiting an enzyme that breaks down testosterone, allowing more of the hormone to remain in the body. Additionally, studies have shown that nettle root extract can help to reduce levels of sex hormone binding globulin (SHBG), which can further increase testosterone levels. Nettle root extract is considered a safe and natural way to increase testosterone levels, and it is available in a variety of forms, including capsules, teas, and tinctures.