Citrate vs. Carbonate after Bariatric Surgery

This is an excerpt from one of the listserves and an interesting topic for someone to write about:

Question about calcium…
In reading the article American Society for Metabolic and Bariatric Surgery Integrated Health Nutritional Guidelines for the Surgical Weight Loss Patient 2016 Update: Micronutrients, I noticed that it does not specify between calcium carbonate and calcium citrate. It states “Calcium carbonate should be taken with meals. Calcium citrate may be taken with or without meals” But when I look at vitamins available and read protocols for other bariatric sites, it always emphasizes calcium citrate. I am new to bariatric needs, is this new/changing information? Are there any programs who recommend calcium carbonate as long as it’s with meals? Is there a difference if it’s a sleeve or a GB?