oral b12 or injection B-12 Injections – Well Life Medicine B12 Injections vs Oral Supplements:

Several strong evidences prove that severe B 12 deficiency leads to neuropathy or pernicious anemia, ileal resections, and gastrectomy (Dagnelie et al., 1989

Extreme deficits (800-1,000 calories below maintenance) are unnecessary and counterproductive because they increase muscle catabolism and metabolic adaptation

Having all four feet and teeth to deal with can be overwhelming, even for someone used to giving sub-q fluids

Studies such as this one published in PMC highlight the role of malabsorption from mucocutaneous disorders like epidermolysis bullosa can lead to deficiencies that cannot be addressed adequately with oral supplements