Licorice root

Licorice root is a typical component in the sweetening of sweets and drinks. It's also a well-known natural cure in holistic medicine, where it's used to treat everything from chronic pain to chronic coughing. Several studies in recent years have discovered that licorice may also alter hormone levels, perhaps leading to a decrease in testosterone over time. In one research, 25 males received 7 grams of licorice root every day for one week, resulting in a 26% decline in testosterone levels.

Another small research found that licorice may lower testosterone levels in women, with 3.5 grams of licorice daily lowering testosterone levels by 32% after just one menstrual cycle. Remember that this relates to licorice root, not licorice candy, which frequently contains no licorice root.