Soy may interfere with thyroid medication
Soy isoflavones may interfere with levothyroxine absorption and possibly thyroid function itself. Effect varies between individuals.
Maintain consistent soy intake. Don't take soy supplements same time as thyroid med.
Separate soy supplements from thyroid medication by 4+ hours
Soy may interfere with thyroid medication. Maintain consistent soy intake. Don't take soy supplements same time as thyroid med.
Separate soy supplements from thyroid medication by 4+ hours
This interaction is rated “Caution” by Formulate. Soy isoflavones may interfere with levothyroxine absorption and possibly thyroid function itself. Effect varies between individuals.
The free checker lets you add any combination of supplements and medications at once. Formulate's desktop app goes further — every stack change surfaces interaction alerts automatically.
Medical disclaimer. This page is for educational purposes only and does not replace advice from a qualified healthcare provider.