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“Vitamin D is extremely important for maintaining bone health, but from a mental health perspective, low vitamin D levels have been implicated in depression. One in ten people in the United States will develop depression, and it causes huge losses in quality of life and productivity. Like many Americans, I wear sunscreen, so I lose out on a major source of vitamin D. I take 5,000 mg of vitamin D most days, which is a lot, but my vitamin D levels otherwise run low; most people could take 400 to 1,000 mg.” – Gail Saltz, MD, psychiatrist and author of The Power of Different: The Link Between Disorder and Genius. Here are 9 signs you might not be getting enough vitamin D.