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MedlinePlus.gov on Twitter: "Vitamin D helps your body absorb calcium, one of the main building blocks of bone. It also has a role in your nervous, muscle, & immune systems. You get
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 "Vitamin D Deficiency: Signs Of Vitamin D Deficiency Visible On Skin; Know Symptoms And Food Sources")
Vitamin D Deficiency: Signs Of Vitamin D Deficiency Visible On Skin; Know Symptoms And Food Sources
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Answer Bank: Does vitamin D protect against COVID-19? - CGTN
Calcium, vitamin D, and your bones: MedlinePlus Medical Encyclopedia
VITAMIN D - 16 Health Benefits and 15 Vitamin D Rich Foods - Ecosh
Vitamin D vs. D3: Differences, similarities, and which is better for you
