low b12 despite injections Pernicious Anemia: Definition, Symptoms, Causes & Treatment What You Need to Know

The honest position is this: there is no head-to-head human bioavailability trial telling you which route is superior for this specific molecule, so the best route is not a settled question

Significant main effects of treatment group (prior to BenjaminiHochberg correction since none were significant after correction, although the necessity of correction for multiple comparisons in exploratory analyses remains unresolved 49 ) were observed for the unclassified group and ten classified genera, namely, Acetatifactor , Akkermansia , Erysipelatoclostridium , [ Eubacterium ] coprostanoligenes group , Family XIII UCG-001 , Lactobacillus , Parasutterella , Ruminiclostridium 6 , Ruminococcaceae UCG-004 , and Ruminococcaceae UCG-009

You follow a strict vegan or vegetarian diet: B12 is found almost entirely in animal products

However, it is imperative to note that findings from animal models cannot be directly extrapolated to clinical trials in humans