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Oral vs. Intramuscular Vitamin B12 in Vitamin B12 Deficiency The Blood Project Vitamin B12 Injections When Will You Notice the Effects? Medications Known to Decrease Vitamin B12 Levels Vitamin B12 Injections: Good or Bad? Vitamin B12 Deficiency Vitamin B12 deficiency happens when the body does not have enough vitamin B12. Vitamin B12 is important for making healthy red blood cells and keeping nerves
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