b12 injection site arm Frequency: How Often Should You Get a Shot? Best Vitamin B12 Injection Site:

Proton pump inhibitor and histamine 2 receptor antagonist use and vitamin B12 deficiency

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Weekly dosing is great for those with severe deficiencies or major neurological symptoms

Management of Metabolic Conditions: For individuals with metabolic disorders, such as folate deficiency or conditions that affect B12 metabolism, B12 injections are often incorporated into treatment plans to optimize vitamin levels

However, the primary use of B12 injections around the world, and the main reason people need it so badly, is because of a disorder called pernicious anemia