Reply To: I am scared I have taken too much Vit d3. I took 15,000 iu per day for the last two weeks. On the bottle it said to take one to 3 pills (each pill is 5,000iu). I started them as I saw a study that d3 deficiency is a cause for Fibroids. I have not had my levels tested but didn't know you could take too much. I just feel very "antsy" or kind of strange and also tired but not sleeping well which is why I thought maybe I took too much. Now I read you aren't supposed to take that much d? Please let me know how long this D will stay in my system. I am not going to take any more of it.