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That's where B12 steps in

J Neuroendocrinol

It helps in forming red blood cells, DNA synthesis, and maintaining the health of nerve cells

becomes particularly relevant, and the answer truly varies depending on a few key factors: The Underlying Cause of Deficiency: The Underlying Cause of Deficiency: Pernicious Anaemia/Malabsorption: For those with an inability to absorb B12 orally (like in pernicious anaemia), injections are typically a lifelong treatment

B12 Shots Injections deliver Vitamin B12 directly into the muscle, allowing it to enter the bloodstream immediately

Vitamin B12 requires intrinsic factor, a protein produced by the stomach lining, for absorption in the small intestine