metformin and b12 injections use vitamin deficiency: New MHRA guidance Metformin users at risk for
Description
Related: How To Tell If You Need Vitamin D Supplementation
Intuitively, it makes sense to assume that the B12 forms found naturally in food are exactly those our body needs

NAD+ replenishment improves lifespan and healthspan in ataxia telangiectasia models via mitophagy and DNA repair

Thus, IM administration remains the preferred route of B12 replacement in cases of known malabsorption or severe deficiency
for instance, a few people experience nausea, upset stomach, or diarrhea after the injection
