Besides the stuff in the milk by the small Italian mountain village, a Japanese company has created chewing gum which enlarges the breast size by 80% in around 70% of people within 2 months, and

a 95% success rate for most women

(which I thought was an odd one…). Other effects are firmer breasts, less menstrual cramps, thicker and faster hair growth and more hydrated skin. Yay for modern science!