Was doing some researching into this...and this was like the first thing that came up
https://www.huffingtonpost.com/lani-simpson-dc-ccd/calcium-heart-attacks_b_1553873.html
Digging a little deeper, I think the recommendation is for Sleeve patients only, given the issues Sleeved folks have with acid production, it would make sense that using an acid reducing calcium carbonate would be a decent idea, however in bypass patients, with the stomach coming in later to our tracts, it might not be such a smart idea.