how fast does b12 injection work Quickly Shot Work? Duration of Benefits How Long Does Vitamin B12

If youre severely deficient, your provider may recommend more frequent injections at firstoften once per week before switching to monthly maintenance doses

Energy levels, mood, and cognitive function generally continue improving throughout this period

Generally, when treating a B-12 deficiency, youll get a 1,000-microgram shot every day or two for the first week (2)

Over weeks two through four, your bone marrow produces new, healthy, normal-sized cells, which can improve endurance, restore a healthier skin tone, and reduce symptoms like heart palpitations tied to anemia

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