Check your D3 levels About 5 years ago, my doctor randomly tested me for Vitamin D levels. My level was about 20 ng/ml where you should be at least 30 ng/ml a

Check your D3 levels About 5 years ago, my doctor randomly tested me for Vitamin D levels. My level was about 20 ng/ml where you should be at least 30 ng/ml and likely closer to 40 ng/ml. My doctor recommended that I start taking 1,000 I.U. of Vitamin D3 per day which I did. For fun I looked up the problems that can be caused by having insufficient Vitamin D: http://www.webmd.com/food-recipes/vitamin-d-deficiency http://www.webmd.com/food-recipes/vitamin-d-deficiency Heart disease, cognitive impairment, asthma, cancer, etc. Yeah - cancer. In addition, a Vitamin D deficiency can actually cause back pain. That was my only major symptom. It's been 5 years and I haven't had a back pain episode since I started taking Vitamin D. Anecdotal, of course. But my levels are where they should be now and I just take one tiny Vitamin D3 pill per day.