Can I take Magnesium and St john's wort together?
Drug interaction guide
Originally published 25 Jan 2026
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There are no known significant interactions between magnesium supplements and St John's Wort. It is generally considered safe to take these two together.
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Why this happens
Magnesium and St John's Wort are processed by the body through different pathways. Magnesium is a mineral primarily regulated by the kidneys, while St John's Wort affects liver enzymes (specifically CYP3A4). They do not interfere with each other's absorption or effectiveness.
What you should do
You can take these together. However, always inform your doctor or pharmacist about all supplements you are taking, as St John's Wort interacts with many prescription medicines (such as antidepressants, blood thinners, and the contraceptive pill).
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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.
Descargo de responsabilidad
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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Historia del artículo
La información de esta página ha sido redactada y revisada por médicos cualificados.
25 Enero 2026 | Publicado originalmente

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