Can I take St john's wort and Vitamin d together?
Drug interaction guide
Originally published 25 Jan 2026
Répond aux besoins du patient lignes directrices éditoriales
- TéléchargerTélécharger
- Partager
- Langue
- Discussion
St John's Wort may lower the levels of Vitamin D in your body, potentially leading to a deficiency. This means your Vitamin D supplement might not work as well as it should to support your bone health and immune system.
Dans cet article :
Poursuivre la lecture ci-dessous
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.
Poursuivre la lecture ci-dessous
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.
Clause de non-responsabilité
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.
Patient picks for Drug interactions
Traitement et médicaments
Can I take Citalopram and Co codamol together?
Taking these two medicines together can increase the risk of a rare but serious condition called serotonin syndrome. It can also make you feel more drowsy or dizzy than usual. Additionally, citalopram may slightly reduce how well the codeine part of the co-codamol works to relieve your pain.
Traitement et médicaments
Can I take Idapamide and Ramipril together?
Taking indapamide and ramipril together can cause your blood pressure to drop too low, especially when you first start the combination. This can make you feel dizzy, lightheaded, or faint. It can also put extra strain on your kidneys.
Poursuivre la lecture ci-dessous
Historique de l'article
Les informations contenues dans cette page sont rédigées et évaluées par des cliniciens qualifiés.
25 janvier 2026 | Publié à l'origine
Demandez, partagez, connectez-vous.
Parcourez les discussions, posez des questions et partagez vos expériences sur des centaines de sujets liés à la santé.
Vous ne vous sentez pas bien ?
Évaluez gratuitement vos symptômes en ligne
Inscrivez-vous à la newsletter destinée aux patients
Votre dose hebdomadaire de conseils santé clairs et fiables, rédigés pour vous aider à vous sentir informé, confiant et maître de la situation.
En vous abonnant, vous acceptez notre politique de confidentialité. Vous pouvez vous désabonner à tout moment. Nous ne vendons jamais vos données.