There are LOTS of heavily marketed proposed "nonsurgical", "noninvasive" alternatives, "cures" and "magical cures" to droopy (ptotic) breasts. Just look at the back of any women's magazines.
The sad fact is that NONE of them really do what they imply they will do. Although these lotions, creams and exercisers have different "mechanisms" - they all share in common one fact - they are rip offs that do not work.
If your breasts are sagging they will need some form of lifting with or without implant placement. You will need to wait 6-8 months after your are done breast feeding your last child before contemplating a Breast Lift (Mastopexy). In the meantime, save your money for something nice for the baby or yourself - do NOT waste it on any magical breast lifters.