Hi there, I've been doing fine taking 10,000iu per day B12 sublingually and in order to reduce my outgoings I decided to halve that to see if I could get by on less. The result was that within two weeks I had the headaches and pins and needles again. Before supplementing my B12 had got down to 270 but my GP thought that was OK despite my symptoms. Thanks to this site I realised that I ought to start supplementing. I have Hashimotos too. My GP did ask for an intrinsic factor test and parietal cell test, they did the parietal test (neg) but not the intrinsic factor! My GP is very helpful and will do any tests I ask for within reason but I don't know what will help to decide if it's B12 deficiency or PA now that I'm supplementing (back up to 10,000iu now).
Many thanks for your help