If you have any sort of GI issue (GERD, reflux, SIBO/SIFO, yeast problems, chronic constipation, etc.) you will have problems taking oral forms of vitamin B12
Biomarkers normalise more rapidly than an improvement or reversal of (neurological) symptoms
CD320 is a protein that carries B12 across the blood-brain barrier
Vitamin B12 requires an intrinsic factor-mediated active transport for absorption, therefore, lack of or inhibition of intrinsic factor results in pernicious anemia
I dont know the answer to this, but I think right now, without having anybody being able to monitor this, I dont know how we get past just the influencer phase of people recommending this, because I dont know how were going to get there