Does Soy foods Affect Thyroid Glandular?

Amount or timing may matter

The short answer

Soy isoflavones inhibit thyroid peroxidase and may reduce absorption of thyroid hormone from glandular supplements.

How to arrange timing

Take thyroid glandular supplements at least 4 hours apart from soy products.

Reference

Reference noted for this food and supplement combination: Fitzpatrick, Environ Health Perspect 2000; Examine.com

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.