Can I take Folic acid and Vitamin D together?
Drug interaction guide
Originally published 25 Jan 2026
Meets Patient’s editorial guidelines
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There are no known harmful interactions between folic acid (Vitamin B9) and Vitamin D. In fact, these two vitamins are frequently taken together in multivitamins and prenatal supplements.
Why this happens
Folic acid and Vitamin D are processed by the body through different pathways. They do not compete for absorption in the gut, nor do they interfere with how each other is broken down or used by the body's cells.
What you should do
It is safe to take folic acid and Vitamin D at the same time. Always follow the dosage instructions on the packaging or those provided by your healthcare professional.
Important precautions
Vitamin B12 deficiency (Pernicious Anaemia)
Folic acid can mask the symptoms of vitamin B12 deficiency. If you have B12 deficiency, taking folic acid alone can allow serious nerve damage to progress even though your blood count appears normal. Your doctor must ensure your B12 levels are checked before or during treatment.
Hypercalcaemia (high blood calcium levels)
Do not take vitamin D supplements if you have high levels of calcium in your blood or urine, as this can lead to serious kidney damage and heart rhythm problems.
Food and drink warnings
Alcohol
It is best to avoid or strictly limit alcohol while taking folic acid. Alcohol interferes with the way your body absorbs and uses folic acid, which can make the treatment less effective. Chronic alcohol consumption is a common cause of folate deficiency.
It is best to avoid or strictly limit alcohol when taking Vitamin D. Long-term or excessive alcohol consumption can interfere with how your body absorbs and processes Vitamin D, making the supplement less effective.
High-fat meals
Vitamin D is a fat-soluble vitamin. It is best absorbed by your body when taken with a meal that contains some fat (such as eggs, avocado, nuts, or dairy).
Using other medicines
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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