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When to Consider Vitamin B12 Injections If You Have a Deficiency : People who have been diagnosed with a vitamin B12 deficiency, especially those with underlying health conditions that affect absorption, may benefit from the rapid absorption and higher bioavailability offered by injections

The speed at which you experience a pick-me-up after a B12 injection can vary depending on a few factors: The Severity of Your Deficiency If you have a mild deficiency, you might feel a difference in energy levels within a few days to a week

Avoid compensating by doubling subsequent doses, as this increases side effect risk without recovering the lost metabolic advantage

Megaloblastic anemia, in which red blood cells are larger than normal and smaller in amount Pernicious anemia, a type of anemia caused by lack of intrinsic factor Numbness and tingling in the hands and feet Dementia Depression Seizures Fatigue Sore mouth or tongue Palpitations Pale skin Weight loss Infertility Some of these side effects, particularly nervous system side effects and psychiatric problems, can be irreversible if not treated promptly

These bacteria switch to producing porphyrins, the researchers explained, and in some people, this uptick in inflammatory compounds may contribute to acne