Dr. Joseph Mercola - Take Control of Your Health Low Vitamin D Levels Raise Risk of Hospitalization for Respiratory Tract Infections
Mar 3, 2026
They explore how very low vitamin D sharply raises the risk of hospitalization and even death from respiratory infections. Discussion covers vitamin D acting like a hormone to reprogram immunity and protect airways. They highlight how sunlight, diet, movement, and supplements with magnesium and K2 influence levels. Practical strategies for testing and targeting higher vitamin D for resilience are offered.
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Vitamin D Functions As An Immune Hormone
- Vitamin D acts as a steroid hormone that programs immune genes rather than just a bone vitamin.
- Joseph Mercola explains it enters cell nuclei to unlock DNA and reprogram immune responses, so deficiency disrupts genetic-level communication.
Low Levels Strongly Predict Hospitalization Risk
- Severe vitamin D deficiency (<6 ng/mL) raises hospitalization risk for respiratory infections by about 33% compared with ~30 ng/mL.
- The relationship is continuous: each 4 ng/mL increase cuts hospitalization risk ≈4%, so incremental gains matter.
Dual Lung Defense From Vitamin D
- Vitamin D defends lungs two ways: it induces antimicrobial peptides and controls inflammation.
- Joseph Mercola names cathelicidins and defensins as the 'sword' and inflammation modulation as the 'shield' preventing collateral lung damage.