Hi All-- I want to find an expert in the US. If they are near Seattle, WA would be ideal. I was diagnosed with PA 7 years ago at age 40 via antibody to instrinsic factor plus near 100 serum b12 levels by general primary doctor. Never was recommended an endoscopy, but after reading decided I should have one. I receive monthly cyanocobalamin injections and serum b12 levels hover between 300-500. I saw a naturopath that gave me a methycobalamin plus leukovorin ( 60-100 mg) two months ago which is folinic acid. Then I read that Leukovorin is greatly contraindicated with people with PA (even treated) so I am worried. Have symptoms of feeling faint at times, tiredness and tingeling in hands and feet intermitently. Otherwise in good health. Any advice appreciated.