Hi this is the 2nd time my B12 came back high near 1000. Of course doctor doesn't recommend anything. i occasionally get tingling in extremeties, fatigue, and brain fog. Although im not sure if brain fog is from low bodyweight or not. I seem to be doing a little better. I just started to supplement with Thorne's B-complex which has B-6, B-12, & folate. How can I get a more accurate B-12 reading? Should I look into 23andme site? Thanks. I just started Gaps diet too. I have symptoms of SIBO so malabsorption in the small intestine is probable.