What Is the Difference Between T3 and T4?
As my first blog on Thyroid Answers explained, our thyroid gland makes two active forms of thyroid hormone. The first difference between these forms, T4 and T3, lies in how many iodine atoms are attached to the backbone structure. As you might guess, T4 has 4 iodines and T3 has 3 iodines. They are added…