Levothyroxine (T4) for augmentation of antidepressants?

Question from a Member: (Re: augmentation of antidepressants with thyroid hormone for the treatment of major depressive disorder): Can T4 be used instead of T3? On another page on this website, we explained briefly what the different types of thyroid hormones are. There, we noted that levothyroxine (T4) has to be converted in the body…