Well, I would like to know more about the relationship between t3, t4, and
vitamin d, but here is what happened to me. My t3 and t4 is low and my
vitamin d wasso low that I am on 50,000 iu one day a week. I started this on oct.17th and this has made a big improvement. I am not so fatigue, depressed, weak, and I am sleeping like a baby!!!!!!!!!!!!! A major difference in 4 weeks. My endo said today that vit d will make a major difference! Yes t3, t4 problems please get it checked!!!!!!!!!