My doctor said my vitamin D3 levels are extremely low. He now has me taking a supplement at 3000 IUs/day. Low levels of vitamin D may hinder the body's ability to produce/regulate and respond to thyroid hormone, thus exacerbating hypothyroid symptoms. I've been taking the vitamin D for several weeks and am feeling less fatigued and phyically much stronger.
It appears there are a number of people here with hypothyroidism. Am interested in knowing if anyone else is taking vitamin D supplements and, if so, what your experience has been with them.