I've posted a couple times here...all about my possible causes...I thought of something and maybe someone has heard of it? I had bad acid redux for years growing up and for about 14 years I took huge amounts of pepsid ac a day...most days 7 to 10 pills....is it possible or heard of that lowering my stomach acid that much caused a problem with vitamin absorption ? I heard they can prevent b 12 absorption if stomach acid is lowered too much...my blood work comes back normal to high b12 but I had been taking a lot of b12... Is there a different test in bloodwork to get that looks more into vitamin problems?