One A Day Multivitamins

Sorry, cant answer that but I thought multivitimins were supposed to help your insides not clog them up(if it is them thats doing it)

Taking paracetamol used to do that to me too.

Maybe you need to drink more as itl keep your insides 'loose'.

I've never heard of that reaction to vitamins in anything I've read or anyone I've known. Aside from possible questions of absorption of a slick, hard pill, Centrum is an excellent vitamin that would be expected to be a big benefit.

I am not able to take adult vitamins, especially One a Day.... They wreak havoc on my insides. Constipation, cramping, stomach issues...my doctor suggested I take kids vitamins. I take Flintstones with Calcium and then take an extra calcium supplement. They don't bother my stomach or insides at all!

It could be a type of allergic reaction to one of the ingredience.
Have you tried another brand?
If not, you should. Compare and see if the other brand does the same thing to you. If NOT, then I would leave the Centrum alone. It isnt that Centrum is a bad brand, it is just that in ALL vitamins there are many diffrent ingredience , some we cant even sound out the names for. One of those just might be reaking havock on your bowels. !!

Why do yuo take calcium mostly tablets?