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The recommended vitamin B12 intake (in micrograms, or mcg) is as follows: *Adequate Intake S ource: National Institutes of Health Office of Dietary Supplements Unless you have a B12 deficiency or have identified a risk factor for deficiency (like following a vegan diet or having a malabsorption issue), theres no need to take a vitamin B12 supplement
Symptoms, neurological findings, anaemia, adherence, the underlying cause and response over time all matter
Seek medical advice if symptoms persist or worsen
According to the 2025 meta-analysis by Alfalasi and colleagues, sublingual B12 showed an approximate 199% mean increase in serum B12 compared to approximately 307% for intramuscular injections
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