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What dosage of vitamin B12 is typically used for adults?

The government guidelines recommend a daily intake of 2.4 micrograms (mcg) of B12 to prevent deficiency, but for optimal health and disease prevention, we recommend a daily dose of 25 mcg. To get this much -- particularly if you're a strict vegetarian -- you'll probably need to rely on supplements or fortified foods. In fact, B12 may be easier to absorb in supplement form.

If you're over 50 years of age, have acid reflux, or have been told by your doctor that your body has trouble absorbing B12, aim for 400-800 mcg per day to give your body a better chance of absorbing what it needs. Don't worry about overdoing it -- there's no upper limit on B12, which means there's no evidence that high levels (up to 1,000 mcg) are harmful.

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.