Well, I started taking Carlson's 4000IU Vitamin D capsules five days ago.  My D levels have tested in the low 20s for three straight years.  I'm 45, a guy, and struggle massively with anxiety, depression, fatigue, pain.  I feel really out of it, almost completely dysfunctional.  I had been taking a "dissolve-under-the-tongue" brand of D with no results.  But after 4 days on this Carlson's capsule, I have noticed a definite decrease in my symptoms, especially fatigue and pain.  It's quite miraculous.  (I also have sleep apnea, or constant panic awakening, or something, though I am not overweight, and that seems to have decreased a bit as well over the past four days.)  I don't want to say it's a miracle, or completely not attribute it to placebo, but I've been through the ringer with antidepressants and herbal supplements.  I've tried almost every SSRI, SNRI, and every herbal or other "natural" supplement associated with reliving my symptoms in copious amounts, to no avail.  If it turns out much of this was due to vitamin D deficiency and taking that supplement is all I need to do to correct it, praise the gods.  I wish you luck and hope you find a solution to your issues.   Chris