Symptoms of Vitamin D deficiency are VERY subtle.
Vitamin D deficiency - Wikipedia
 "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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Vitamin D: 15 ng/mL
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Vitamin D deficiency: problem runs bone-deep
