Studies suggest that vitamin D deficiency could worsen fibromyalgia symptoms. In one study of women with fibromyalgia who had low levels of vitamin D, reduction in pain occurred after 20 weeks of supplementation. That might seem like a long time, but trust me, it flies by. Vitamin D deficiency is a common problem in the winter because we are less likely to be outside in the sunlight. Without adequate vitamin D levels, our bodies cannot absorb calcium properly, which can cause osteoporosis in adults. Vitamin D is really important for so many things, such as bone strength, the reproduction and growth of cells, the functioning of our immune system, and neuromuscular (nerves and muscles) health. Although I know how important this is, I still struggle with consistency in taking my vitamin D supplement. I tire of taking so many pills every day. However, after researching this, I'm going to put it on my night table so I don't forget. I've heard that you would need to get about 20 minutes of sunshine daily to get adequate levels of this important vitamin. It explains why in the winter I feel more fatigued. I don't get out and walk as much, and I tend to hibernate. Your doctor can check vitamin D levels with a blood test. I've been put on a high-dose prescription of vitamin D for several months after my level got really low. Now, I take a maintenance dose of 2,000 IUs.