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Security Now (Audio) · Dec 28, 2025
SN 1058: A Gift for the New Year - Vitamin D Revisited
“Health research organization offering retail blood testing services for vitamin D and other health markers at $47-67 per test”
Vitamin D physiology and metabolism (UVB conversion, liver hydroxylation, kidney activation)Vitamin D deficiency epidemic and prevalence statisticsVitamin D supplementation dosing and safety thresholds
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