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Those experiencing fatigue or hair thinning: B12 injections can improve energy and hair health, whether due to lifestyle factors or underlying deficiencies

Meyer C, O'Keefe F

So you are absorbing less B12 AND eating less of it simultaneously

In extreme cases, people with pernicious anemia or a related condition known as vitamin B12 deficiency myelopathy can develop nerve damage related to vitamin B12 deficiency