calcium citrate vs calcium carbonate

I had my surgery  in 2009 and just realized that although I've been taking calcium citrate I also take the calcium carbonate chewies. Does anyone know if the  500 mg that I get from the chewies am I absorbing all of that?

If you take calcium carbonate with vitamin C it turns into calcium citrate by the chemicals reacting together.  I take Viactive and an orange flavored chewable vitamin C...very tasty.  Tri 

I take the same cheques. How many mg of Vit C do you take with it?

Same chewies

Huh? This magical chemical transformation does not happen. It couldn't be more wrong.

We do not absorb calcium carbonate well at all. No one does, actually, even those who have not had WLS, but it's much worse with us. Calcium carbonate needs a lot of stomach acid to be absorbed, and we just don't  produce nearly enough. For non WLSers calcium carbonate is absorbed a little better with meals, since acid production peaks then, but it just doesn't matter with us.

Taking calcium with Vitamin C makes no difference at all. Vitamin C helps with absorption of iron, not calcium. For every 30mg of iron, you should be taking 200mg of Vitamin C. Don't take your calcium citrate within 2 hours of your iron. The calcium will block iron absorption.

If you like having healthy bones, switch to calcium citrate.

I never heard about that either.

At a conference I was told that while we start to absorb SOME things over the years (like calories!!), we will never be able to get our calcium from carbonate and must always choose citrate.