side effects from vitamin b12 injections in humans How Long Do Stay the Body? Vitamin B-12 Benefits | Uses

Sampson CM, Dimet AL, Neelakantan H, Ogunseye KO, Stevenson HL, Hommel JD, Watowich SJ (2021) Combined nicotinamide N -methyltransferase inhibition and reduced-calorie diet normalizes body composition and enhances metabolic benefits in obese mice

It plays a role in: Red blood cell formation: B12 is needed to produce healthy red blood cells, which carry oxygen throughout your body

Acid suppression medications and metformin also reduce vitamin B12 absorption and so increase the risk of deficiency

For a person who cannot absorb B12, the injection is a critical, life-sustaining treatment, not a voluntary supplement

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