Thyroid complex combining a glandular extract, L-tyrosine, and iodine to support healthy thyroid function. BMR Complex provides high quality, thyroxine-free glandular extract with L-tyrosine, iodine, zinc, and copper to support healthy thyroid function. Research shows that L-tyrosine and iodine are critical for the production of the thyroid hormones, thyroxine (T4) and triiodothyronine (T3).