how quickly does b12 injection work Injections: Who Should Get Them and Long Do They Last? Will my B12 Injection Work

Typically, vitamin B12 injections can be effective for about one week

People should contact a doctor for advice if they regularly have problems sleeping.

No significant adverse effects were reported at any dose level tested, including the highest 1mg daily oral dose

Not recommended for use in pregnant or breastfeeding women without consulting a healthcare provider

Vitamin B 12 deficiency symptoms may include: strange sensations, numbness, or tingling in the hands, legs, or feet difficulty walking (staggering, balance problems) anemia a swollen, inflamed tongue difficulty thinking and reasoning (cognitive difficulties), or memory loss weakness fatigue While an experienced physician may notice the symptoms and be able to detect a vitamin B 12 deficiency with a good interview and physical exam, a blood test is needed to confirm the condition