listen, caltrate is nothing more than 600mgs. calcium carbonate & 400iu of vitamin D3.............plus alot of stuff u don't need to take, like talc & other stuff they use to make a hard pill..........if u buy a calcium carbonate supplement & vitamin D3, u get the same things, besides, u can get it in capsules without the additives..........besides most people need more than 400iu of vitamin D............if u buy them separately, then u can take exactly what u need..............cal carb is mostly for soaking up the excess liquid, u'd b better served finding out why there's too much liquid in ur intestines............with ibs, u have digestion problems & with this u can have a hard time breaking down hard pills, so a capsule works much better, anyway...........sometimes u only breakdown part of the pill...........i have problems with this myself, so i buy capsules as much as possible............check vitacost.com or iherb.com...........they have a wide selection of vits, minerals & herbs............