I purchased some WP Thiroyd and started at 1grain, adding half a grain in the afternoon after a couple of weeks. I have also been having Vitamin B12 Injections at my GP. I've now got the most awful Acid Reflux (GERD). Pain under left rib, thick mucassy feeling in my throat, generally feeling rubbish all the time. GP gave me Omeprazole proton pump inhibitors to take daily for two weeks - no improvement. Is GERD linked to taking NDT?