If you are at increased risk of B12 deficiency, supplements are one way to increase B12 intake after being approved by a medical professional
This would need to be followed by 100 to 1,000 mcg administered by injection every one to three months
Mood changes, including low mood or irritability
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This impairment of DNA synthesis affects the rapidly dividing cells of the bone marrow earlier than other cells, resulting in the production of large, immature, hemoglobin-poor red blood cells (macrocytosis), as well as effects on white blood cells, including abnormal (hypersegmented) neutrophils and reduced overall cell counts (pancytopenia)
Long-term safety is unknown