Here are some recent articles about Vitamin D:
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The Best Time to Take Vitamin D for Optimal Sleep and Health – Verywell Health
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5 New Things Scientists Have Learned About Vitamin D This Year – MindBodyGreen
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Seize the D: Why summer is the perfect time to get serious about the sunshine vitamin – The Irish News
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Can Vitamin D Help Treat Depression? – Yahoo Health
Feel free to check them out!