Vitamin D
Vitamin D is both a nutrient we eat and a hormone our bodies make. It is a fat-soluble vitamin that has long been known to help the body absorb and retain calcium and phosphorus; both are critical for building bone.
Why a doctor may order this
To diagnose vitamin D deficiency/insufficiency and guide supplementation, especially for bone health or high-risk patients.
Why you may need this
If you have low sun exposure, darker skin, bone pain, muscle weakness, or autoimmune/metabolic conditions — vitamin D deficiency is very common.
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