Because B12 levels arent checked during routine blood work, a deficiency can go undetected for years, Dr
Vitamin B12 injections begin working at a cellular level almost immediately after administration, though the timeframe for noticeable symptom improvement varies considerably between individuals
How to Administer a B12 injection to Yourself There are two ways to self-inject vitamin B12: Subcutaneously, or just below the skin, and intramuscularly, which goes directly into the muscle, says Foxx
Vitamin B12 is responsible for making red blood cells, white blood cells, and platelets
Your GP may arrange periodic blood tests to ensure B12 levels remain adequate, though clinical response is generally more important than specific blood values once treatment is established
Underlying conditions: digestive disorders like Crohn's or celiac disease, or autoimmune conditions, can cause you to use up B12 faster and may call for more frequent injections