I think it's just a placebo effect; I thought my breasts were getting a bit fuller, but I think that was more weight-related. I took Bustmaxx for three months with no definite results, and decided it was too expensive to be worth continuing when I didn't even know for sure if it was working. I may have made the right decision, because my breasts shrank a bit again when I lost weight. That being said, maybe it was working and would have been noticable after six months or so. I just couldn't afford to continue on uncertain results.