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B12 Intravenoso: Applications in Acute Settings In urgent situations, like being in the hospital for a severe B12 deficiency or after some surgeries, IV B12 is very helpful

They also have their own unique roles: Thiamine helps keep your nervous system healthy

If your B12 deficiency is severe, it could take 4-6 weeks of injections before you really start to turn the corner and feel like your old self again

Most healthy adults have a heavy store (up to several years worth) of B12 in their liver

If storing the medication at home, do not leave it in locations such as the bathroom or car, and keep the medicine out of the reach of children