The Licorice (Glycyrrhiza glabra ) they are referring to is a flavorful herb that has been used in food and medicinal remedies for thousands of years. Also known as “sweet root,” licorice root contains a compound that is roughly 50 times sweeter than sugar.
I am not sure about using it to decrease testosterone levels, but I have used Licorice Root Extract to support my adrenal glands when my cortisol levels were low. A primary compound in licorice root is glycyrrhizin (a substance that has a molecular structure similar to corticosteroids). As such, licorice root aids in hypoadrenalism by partially blocking the enzyme that converts cortisol to cortisone, thus sparing cortisol. You can also use to for heartburn and other stomach problems in the form of deglycyrrhizinated licorice (DGL).
The candy licorice that you are referring to above and most are familiar with from childhood has the ingredients of licorice extract only in black colored licorice, all other licorice does not contain licorice extract, sugar, and a binder. two different things.