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Intravenous (IV) Administration Protocols Intravenous vitamin B12 is for those with severe deficiency or malabsorption

While there's no one-size-fits-all answer, many health professionals recommend getting B12 injections every few weeks to maintain optimal levels

Heres how Id approach it: Start with half the standard dose (0.25mL weekly) Test MMA every 2 weeks to see how your cells are doing Bump up the dose by 0.1mL until MMA drops below 0.4 mol/L Thats your personal sweet spot the minimum dose that actually works When Your Labs Look Great But You Feel Terrible Sometimes your numbers look perfect on paper, but you still feel like garbage

Human Molecular Genetics , vol