Vitamin D

So awhile back I was feeling really horrible--worn down and tired all of the time and just "off."  My doctor ran a bunch of tests and the only thing that came back out of the ordinary was really low Vitamin D levels, so he put me on a supplement.  Well, it has been about 6 weeks and I feel SO much better!  I was curious, so I did a bit of research and found that fatigue, muscle aches, and depression can all be signs of vitamin D deficiency.  Who knew?  I am so glad that my doctor is thorough and checked it!