Calcium glycerophosphate (brand name Prelief) is a relatively new mineral complex primarily used to neutralize acidic foods when consumed and to protect teeth. Prelief is AkPharma's brand name has a number of important uses. As a palliative in interstitial cystitis, prostatitis, overactive bladder. As a symptoms reducer in irritable bowel syndrome. Through a mechanism not fully elucidated, but it appears to reduce cellular inflammation in the urinary bladder.