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Injectable B12 delivers the vitamin directly into the bloodstream, allowing for immediate absorption

Vitamin B12 is a vitamin essential for many bodily functions, including energy production, brain function, and the formation of red blood cells

Acta Medica Scandinavica, 184: 247258

Conclusion Whilst severe B12 deficiency has a clear clinical picture with characteristic haematological and/or neurological features, establishing mild or borderline deficiency can be problematic as serum levels are maintained at the expense of tissue concentrations, and therefore serum levels of B12 may be in the low normal or borderline range despite a deficiency