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Effect of calcium citrate vs calcium carbonate on elevated parathyroid hormone after Roux‐en‐Y gastric bypass. A double‐blinded, randomized trial

Following Roux‐en‐Y gastric bypass (RYGB), elevated parathyroid hormone (PTH) levels potentially harmful to bone health are commonly observed. Owing to assumed superior absorption, calcium citrate is often recommended over calcium carbonate following RYGB for the treatment of elevated PTH. We aimed to investigate the impact of either calcium carbonate or calcium citrate (1200 mg elementary calcium) in patients with elevated PTH levels following RYGB.