b12 sub q injection sites How to self-inject intramuscular vitamin - Overview Best Vitamin B12 Injection Sites:

What You Can Expect After a B12 Shot Most people notice a difference within a few days sometimes even within hours

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What to expect week by week

Vitamin B12 Vitamin B12 supports red blood cell formation, neurologic function, and energy metabolism

While B12 is generally safe, caution is needed in specific clinical situations: Lebers Disease (Hereditary Optic Neuropathy): B12 injections are generally contraindicated or should be used with extreme caution, as they may potentially aggravate optic atrophy in this rare condition