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Can I take 1.5mg and Vitamin b12 together?

Drug interaction guide

There is no known interaction between vitamin B12 and other medications or supplements based on the dosage provided (1.5mg). Vitamin B12 is a water-soluble vitamin that is generally very safe to take alongside other treatments.

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Why this happens

Vitamin B12 is absorbed in the small intestine and does not typically interfere with the chemical pathways, liver enzymes, or kidney excretion processes used by most other drugs. It does not have any known additive or opposing effects when taken with common medications.

You can safely take vitamin B12. If you are taking 1.5mg (1500 micrograms) as a supplement, this is a high dose compared to the daily requirement, so ensure this has been recommended by a healthcare professional to treat a specific deficiency. Always inform your doctor or pharmacist of all supplements you are taking.

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Taking multiple medicines? Our Medicines Interaction Checker helps you check whether your prescriptions, over-the-counter medicines, and supplements are safe to take together. Simply search for your medicines to see potential interactions and what to do about them.

Disclaimer

This information is for general educational purposes only and should not be relied upon as a substitute for professional medical advice. Always consult your GP, pharmacist, or another qualified healthcare professional before making decisions about your medications. Individual circumstances may vary, and only a healthcare professional who knows your medical history can provide personalised guidance.

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Article history

The information on this page is written and peer reviewed by qualified clinicians.

  • 14 Mar 2026 | Originally published
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