Hi everyone, I have just been diagnosed with auto-immune thryoiditis after doing a private blood test (also have vitiligo another auto-immune). As advised in Thyroid UK group I included B12 levels in the assay. This came back as a level of 278 - not massively low apparently but TRUK advise 500 min, 1000 ideal. So I have started daily Solgar 5000mcg sublingual lozenges. I am not vegetarian and eat plenty of meat, eggs, fish and dairy so a low B12 would be unexpected. Question - is that low enough to be suggestive of an underlying disorder like PA? If so is that an appropriate supplement? How long do I have to be off supplements for another blood test to be unaffected?