I started 5000iu a day about 9 months ago after wellbutrin turned me into an all of paranoia. Normally I get depressed through winter because December is the anniversary of my son's death and it just hits me. This year, with vitamin d, was the first time in 14 years that I was actually happy around Christmas. I haven't had a depression last more than a few days whereas before they could go for 6 months or more. I did it under the direction of my psych nurse and I love it.