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The approach to Vitamin C and D Injections is quite similar to that of Vitamin B12 injections

Because the intranasal forms have lower absorption than the IM dosage form, intranasal B12 forms are administered once weekly

Dietary sources of Vitamin B12 include meat, fish, eggs, and dairy

How long the injection lasts depends on several factors: How severe the deficiency is A persons age and how fast their body processes things Problems with digestion or absorbing nutrients Daily habits or activity levels How often does the body use B12 inside its cells People with pernicious anemia or ongoing deficiency often get weekly shots, while others do fine with a monthly injection