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Because it is injected straight into the bloodstream, it can be used to supply vitamin B12 to people who cannot absorb this vitamin through the intestine

B12 injections are intramuscular shots that deliver vitamin B12 directly into your muscle tissue, typically in your arm or thigh

Once neurological symptoms appear, deficiency may already be advanced - but treatment can still be highly effective when started promptly

If you get a B12 injection and it stings, that means it's not just B12

Retrieved May 3, 2025, from (Notes that riboflavin is a key coenzyme in energy metabolism