Can I take D3 and Synthroid together?

Why this happens

Vitamin D3 supplements do not typically interfere with how the body processes levothyroxine. However, some Vitamin D supplements also contain calcium. Calcium is known to bind to levothyroxine in the gut, which prevents the thyroid medicine from being absorbed into your bloodstream.

You can safely take both, but it is best to separate them. Take your Synthroid on an empty stomach, at least 30 to 60 minutes before breakfast. Wait at least 4 hours after taking your Synthroid before taking any supplement that contains calcium or high doses of Vitamin D to ensure your thyroid levels stay stable.

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.