Can I take supplements with thyroid medication?

Reviewed by Yoshinori Abe, MD

Internal Medicine

Yes, you can take supplements with thyroid medication, but timing and type matter. Certain supplements—especially calcium, iron, magnesium, and biotin—can interfere with how thyroid medication is absorbed or measured in blood tests. To avoid problems, take thyroid medication on an empty stomach and wait at least 4 hours before taking these supplements. Always consult your doctor before starting anything new.

Because thyroid symptoms overlap with many other conditions, and supplement interactions can mimic or mask issues, it's important to understand what your body is actually telling you. A free, instant, online symptom check can help you identify possible causes of how you're feeling and guide your next steps—whether that's adjusting your routine, asking better questions at your next appointment, or seeking care sooner. It takes just a few minutes and could bring you real clarity.

Reviewed for medical accuracy: 07/20/2026

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Explanation

Taking supplements with thyroid medication can be tricky because some supplements might interfere with how well the medication works. For instance, certain protein supplements have been shown to impact thyroid function. If you're experiencing unusual symptoms or concerns about your thyroid health, you can use a free symptom checker to help assess your condition before consulting with a healthcare provider.

Key Points to Consider:

Timing: Some supplements can affect the absorption of thyroid medication. It's often recommended to take thyroid medication on an empty stomach and wait 30-60 minutes before eating or taking other supplements.
Types of Supplements: Not all supplements are the same. While some may not affect your thyroid medication, others, like certain protein supplements, could interfere with its effectiveness.
Consult Your Doctor: Always talk to your doctor before starting any new supplement. They can provide guidance based on your specific health needs and the type of thyroid medication you're taking.

Remember, being informed and cautious can help ensure your thyroid medication works effectively.

(References)

Benvenga S, Feldt-Rasmussen U, Bonofiglio D, & Asamoah E. (2019). Nutraceutical Supplements in the Thyroid Setting: Health .... Nutrients, 31540254.
Kumarathunga PADM, Kalupahana NS, & Antonypillai CN. (2021). Over-the-counter protein supplement resulting in impaired .... Endocrinology, diabetes & metabolism case reports, 34280893.
Wiesner A, Gajewska D, & Paśko P. (2021). Levothyroxine Interactions with Food and Dietary .... Pharmaceuticals (Basel, Switzerland), 33801406.

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