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All of these could be causes of Vitamin B12 deficiency

The injectable formulation is designed to quickly replenish Vitamin B12 levels, essential for nerve function, DNA synthesis, and red blood cell formation

B12 injections are typically administered directly into the muscle, known as intramuscular injection

Those with pre-existing conditions such as irritable bowel syndrome (IBS), functional dyspepsia, or gastritis may be more prone to experiencing stomach upset from supplements generally, including B12 preparations

Most patients start to experience these treatment benefits during the initial weeks of their therapy