how often to have b12 injections get vitamin how long does a b12 injection take to work How Often Can I Take B12 Injections? Vitamin B12: How Frequently Should
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This may vary from twice weekly to once every 2-4 weeks (source: The basics of treatment It is not understood why certain patients require more frequent B12 treatment

Most people find the first week is less about dramatic change and more about building a small, consistent habit
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Autoimmune and inflammatory conditions : Diseases such as rheumatoid arthritis or lupus can cause high B12 levels

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Primate GLP study The Good Laboratory Practice (GLP) compliant primate study tested three dose levels in lean rhesus monkeys: 0.25, 0.43, and 0.75 mg/kg administered daily for 28 days
