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Most dietary B12 come from animal sources
These injections are often recommended if your body has trouble absorbing B12 from food or if you have a deficiency
Without enough vitamin B12, homocysteine can build up
Vitamin B12 injections can be effective for raising the vitamin B12 levels in the blood quickly for those with vitamin B12 deficiency
The duration of vitamin B12 effectiveness depends on your health condition and the supplement type, and the severity of your deficiency
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