I still noticed that there are others who had the same problem as I with the B12. It feels like you go major hyperthyroid for some days, and it isn't pleasant. It isn't a thyroid problem however, but some affected thought it was. It is an adrenal problem. I had by my B12 values measured, and there was a significant rise after taking some 10-15 mg B12 doses in tablet form over a month. I have candida, but I appear to absorb it well. It could also be the cyanide in the cyanocobalamin form that kills off some fungi?