Hello, I am new here. Wondering if anyone can shed possible reasons for a high deficiency in B12 in the cells per NutrEval results, while the serum levels were off the chart high while taking methyl B12? I was instructed to stop taking the B12 and a couple years later, my serum B 12 is much lower but still in range. I thought I needed a different form of B12, such as adeno or hydroxy. However, I had an online consult with a practioner who seems to understand NutrEval results and she said I needed Vit E in the form of tocotrienols to get allow the B12 to get into my cells. (I am compound heterozygous for MTHFR, but the practitioner didn't think it was expressing itself as some markers for folate, I believe, were ok.) I read about taking lithium to get B12 into the cells, I do happen to be very low in lithium. Does anyone have any thoughts or experience? I wanted to hopefully get some feedback before I take the plunge and buy all the supplements she suggested (most importantly, per her advice, is niacin and then biotin. Thank you!