Because intramuscular B12 is absorbed more slowly over a longer time frame than intravenous delivery, each shot offers a sustained elevation in serum levels between appointments
Other risk factors include age, digestive issues like Crohns disease, or medications that interfere with B12 absorption
This also makes it the most effective way to treat a deficiency or prevent one in someone who may be prone
What symptoms indicate a Vitamin B12 deficiency
If you experience an allergic reaction to a B12 shot, consult your healthcare professional to discuss alternative treatment options
Generally, B12 shots are designed to provide a sustained boost in B12 levels, but the exact timeframe can depend on factors such as your metabolism, lifestyle, and any underlying health conditions