Calcium carbonate versus calcium citrate?

Okay, I feel really ignorant about this topic. I am 9 months status post open RNY. My surgeon RECOMMENDED that I take Viactiv. Now I read here that our bodies don't absorb the kind of calcium in the Viactiv calcium chews. You mean to tell me that I've just been taking them for nothing? My calcium levels have come back fine. Could someone tell me WHY we don't observe calcium carbonate and what the different is between that and calcium citrate? I never was a great science student. Thanks!

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