A quick question...anyone have any thoughts. My autistic daughter has pernicious and has been taking methylcobalium sublingual drops daily since September 2016( we are in the states). Had blood work done recently and her B12 level was only 428. I expected it to be off the charts with her getting it daily? She is compound heterozygous for the MTHFR gene, so is also taking methyl folate and B6. Any thoughto???