The bottom line is that for diabetics, it is important to consult with a doctor or healthcare provider before taking any vitamin B12 supplement
Despite this, transient increases in plasma glutathione and its metabolites may support antioxidant defenses, modulate immune responses, and influence cellular signaling pathways
They could prescribe B12 as a supplement you take by mouth, a nasal gel or spray, or a shot
[2] Other conditions giving rise to malabsorption include surgical removal of the stomach, chronic inflammation of the pancreas, intestinal parasites, certain medications such as long-term use of proton pump inhibitors, H2-receptor blockers, and metformin, and some genetic disorders