um...my first, intuitive response is to say 'of course they don't work'....just like penis enlargement pills or some other such scam....
but perhaps, if these pills somehow affected hormones or some, they may make boobs bigger (assuming so because i believe i've heard of it being a side-effect of some birth control pills)
but if that is the case, and you'd be screwing with your hormones, then only do so under a doctor's supervision!
and duh, a doc ain't going to prescribe 'bigger-boob' pills, but perhaps if you are on bc, you can ask your doctor if the one you're on has that as a side-effect..
i dunno. on the other hand, you could just consider yourself lucky to have nice little perky tits. learn to love them.
i sure wish i did
(ps)
(and if the desire for bigger boobs is not coming from you but rather about some guy or whatever...ugh. stop. don't do it! you know better.)