Does Dairy Affect Desiccated Thyroid?

Amount or timing may matter

The short answer

Calcium in dairy binds thyroid hormone from desiccated thyroid supplements in the gut, significantly reducing absorption. This is a well-established clinical interaction.

How to arrange timing

Take thyroid supplements at least 4 hours apart from dairy products.

Reference

Reference noted for this food and supplement combination: FDA

Important context

The effect can also change with food amount, supplement dose, product formulation, health conditions, and medication use. Ask a doctor or pharmacist first if you take medication, are pregnant or breastfeeding, or have a chronic condition.