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Vitamin D reduced deficiency in preterm infants, while higher doses increased excess

The Cochrane database of systematic reviews (PubMed)Sep 16, 2026

AI-summarized from the linked source. Educational brief, not medical advice.

Brief summary

A Cochrane review found that vitamin D supplementation probably reduces deficiency in preterm and low-birth-weight infants, while doses of at least 800 IU per day probably reduce deficiency further but increase vitamin D excess compared with lower doses.

What NurseJet pulled from the source

The review included 34 studies with 5,012 infants. In four studies of preterm infants, supplementation versus none reduced vitamin D deficiency (RR 0.20; moderate certainty); in five studies, higher versus lower doses increased vitamin D excess (RR 5.76; moderate certainty).

Why this matters for nurses

Neonatal and pediatric nurses administer supplementation, reconcile total vitamin intake from feeds and medications, and monitor ordered laboratory results. The review supports preventing deficiency while highlighting that more vitamin D is not automatically safer or clinically better.

Bedside takeaway

Reconcile total vitamin D exposure carefully: supplementation reduces deficiency, but higher-dose regimens also increased excess.

Key takeaways

  • Vitamin D supplementation of at least 200 IU per day probably reduced deficiency up to discharge or term-corrected age in preterm infants.
  • Higher doses of at least 800 IU per day probably reduced deficiency compared with 200 to less than 800 IU per day, but probably increased vitamin D excess.
  • Evidence did not establish broader benefits for bone health, growth, other morbidities, or hypercalcemia, and most studies were at high risk of bias.

Practice implications

  • Verify the prescribed cumulative vitamin D dose from all nutrition and medication sources, document administration and feeding changes, and follow the neonatal service's laboratory and dose-adjustment protocol. Do not increase supplementation outside provider orders.

Limitations & cautions

  • The 34 included studies used varied populations and regimens, most were at high risk of bias, and many subgroup analyses were underpowered. Evidence for vitamin D excess came from 395 infants, while bone, growth, morbidity, and hypercalcemia outcomes were limited or uncertain.
  • AI-summarized from the linked source. Review the original article before applying to practice.

Citations

Exact source links

Public citations are filtered to exact credible source pages. Homepage-only or invalid links stay in admin review and are not shown here.

The Cochrane database of systematic reviews (PubMed)

The Cochrane database of systematic reviews (PubMed). Vitamin D supplementation for prevention of vitamin D deficiency in preterm and low birth weight infants.

Open original source

https://pubmed.ncbi.nlm.nih.gov/42746921/

Professional education only

This summary does not replace clinical judgment, facility policy, provider orders, or official guidelines. Verify practice changes against the original source and local protocol.

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