Can I take St john's wort and Vitamin d together?

Why this happens

St John's Wort is a 'liver enzyme inducer'. It speeds up the proteins (specifically CYP3A4) in your liver that break down medications and vitamins. This causes Vitamin D to be cleared from your system much faster than normal.

What you should do

If you are taking both, you should speak to your GP. They may want to monitor your Vitamin D levels with a blood test or suggest increasing your Vitamin D dose. Do not stop taking prescribed medication without consulting your doctor first.

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.