There are few natural alternatives to man-made chemical steroids which are safe and effective. These natural sources are herbal and include: SARSAPARILLA, YOHIMBE, LICORICE, DAMIANA, CORDYCEPS, and TRIBULIS TERRESTRIS."
Licorice will change your singing voice. I have always been blessed with the ability to sing pretty well at least. After taking licorice I couldn't sing well! I had heard that could happen, but didn't take it totally seriously. If singing is not important to you, go for it I guess.