Calcium carbonate is insoluble at moderate to low pHs, that’s why it’s in so many rocks. Organic salts such as the citrate and Ca-containing proteins are usually soluble.
One of my pet peeves with vitamin supplements is that many of them have what’s called “incompatible salts” in chemistry: each of them is water-soluble, but one or another of the crossings is not. If there really are supplements formulated with calcium carbonate directly, the formula might as well say “pebbles”.
Anyone finding this thread - please go to bariatricfacts.org (patient-run) for help. I am 13+ years out from the duodenal switch, 63 years old, enjoying life and enjoying EATING!
You can find help getting insurance approval (for free!), how to pick which surgery, your surgeon and PCP, how to live with your surgery afterwards.
No-one recommends the lap-band ( crap band?) anymore. What, exactly, is your beef with the gastric bypass?
moderate to high, apologies. Apparently my math was taking a day off.
I’m glad this thread got bumped: I have a co-worker with a lap band and I reminded of how glad I am I got a VSG instead.
she is constantly having stomach pain, I worry she needs it taken out. she didn’t keep any weight off at all 
not sure how long ago she got it but I really hope it’s true they aren’t recommending bands anymore - they shouldn’t be still doing them at all.