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Daily Medical Update
Vitamin D Deficiency
Monday, June 08, 2026
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🔬 Practice-Changing Findings
Evidence from RCTs and meta-analyses published in the
last 12 months.
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Nutrients (2026) - Practice Guideline
Key Findings
- Empiric vitamin D supplementation reduced rickets and respiratory tract infections in children in the evidence base used for the guideline.
- Supplementation lowered mortality in adults aged ≥75 years and reduced progression from prediabetes to diabetes mellitus.
- In pregnancy, vitamin D supplementation reduced adverse pregnancy complications in the trials informing the guideline.
📋 Practice Implication: Use targeted empiric supplementation without routine 25(OH)D testing in the specific populations endorsed by the Endocrine Society, rather than defaulting to broad population screening.
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Journal of perinatology : official journal of the California Perinatal Association (2025) - Systematic Review
Key Findings
- High-dose supplementation (≥800 IU/day) increased serum 25(OH)D by a mean difference of 15.62 and improved growth velocity before discharge versus low-dose regimens.
- Compared with 400 IU/day, 800 IU/day reduced vitamin D deficiency risk by 0.21 and lowered skeletal hypomineralization and mortality without increasing vitamin D excess.
📋 Practice Implication: For preterm infants with deficiency risk, dosing protocols near 800 IU/day appear more effective than 400 IU/day for short-term bone and survival outcomes during the NICU period.
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The Cochrane database of systematic reviews (2026) - Systematic Review
Key Findings
- Versus placebo, vitamin D supplementation slightly reduced the proportion of children with ARI-related healthcare visits (RR 0.95, 95% CI 0.91 to 1.00).
- Higher-dose versus lower-dose regimens probably did not reduce ARI visit frequency (RR 0.94, 95% CI 0.81 to 1.10) and showed little to no increase in hypercalcemia.
📋 Practice Implication: Discuss vitamin D as a low-risk preventive measure for young children with realistic expectations: any respiratory benefit appears modest, and escalating above standard doses does not clearly add value.
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Pediatric pulmonology (2026) - Systematic Review
Key Findings
- Children with asthma had decreased serum 25(OH)D versus healthy controls (mean difference -4.89 ng/mL, 95% CI -7.38 to -2.40).
- Severe asthma was associated with decreased vitamin D versus mild disease (mean difference -4.21 ng/mL), while pulmonary function and control measures did not improve consistently.
- Vitamin D showed an inverse association with total IgE (r = -0.37; p = 0.02), but eosinophil counts and IL-10 did not improve consistently.
📋 Practice Implication: In pediatric asthma, low vitamin D functions more as a severity biomarker than a stand-alone treatment target, so correction of deficiency should complement standard controller therapy rather than replace it.
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Nutrients (2026) - Systematic Review
Key Findings
- Vitamin D deficiency was consistently associated with increased sepsis risk, higher mortality, and greater disease severity across adult and pediatric populations.
- Children and neonates with low vitamin D had increased mechanical ventilation needs, longer hospital stays, and higher PRISM III scores.
- Across reviews, vitamin D supplementation did not demonstrate a consistent reduction in sepsis risk or mortality once sepsis was established.
📋 Practice Implication: Treat low vitamin D as a risk-stratification signal in critically ill patients, but do not rely on supplementation as a proven therapy for established sepsis.
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Summary
Recent high-significance evidence on vitamin D deficiency emphasizes targeted supplementation rather than broad untargeted testing: the 2024 Endocrine Society guideline supports empiric supplementation in children, adults aged 75 years or older, pregnant women, and people with prediabetes, while neonatal data favor 800 IU/day regimens in preterm infants. Pediatric respiratory evidence suggests only a modest reduction in acute respiratory infection visits and links lower 25(OH)D levels with greater asthma severity, while critical care evidence positions deficiency as a marker of worse sepsis outcomes rather than proof that vitamin D treats established sepsis.
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