Prematurity

Overview

Three supplements have limited evidence related to prematurity outcomes. Algal Oil (2 studies) given to breastfeeding mothers of very premature infants may support growth in baby girls but not boys, with no effect on brain development by 18–22 months. Iron (2 studies) in breastfed premature or low-birthweight infants may improve height and reduce anemia risk without affecting weight or cognitive outcomes.

A single study of Vitamin D found that a pre-delivery injection in women at risk of early birth lowered serious breathing problems in infants. Evidence remains preliminary across all three. See the heatmap and evidence reviews below.

Effect graph

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Relevant supplements

Relevant supplements sorted by DEX Score.


Iron	★★★★★	Low
Vitamin D	★★★★★	Very Low / None
Algal Oil	★★★★★	Very Low / None

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Studies

Find individual evidence reviews for supplements sorted by DEX Score.

3 supplements for and rated at least stars. All purchase bands. No minimum star filter.

IronView supplement →

Reconsider purchase★★★★★

How we scored this

Effect SizeLowEvidenceMediumTrustMedium

Evidence Review

In premature or low birthweight babies fed breast milk, giving iron supplements by mouth helps them grow taller and lowers their chance of anemia compared to not giving iron.
Iron did not affect their weight, head size, thinking skills, or risks of infection or bowel problems.
For very early babies born at 24-28 weeks, getting more iron by 2 months old was linked to better thinking skills at 2 years old, but this link was not seen with iron given later at 3 months.

Browse 2 studies1 meta-analysis

MetaEnteral Iron Supplementation in Preterm or Low Birth Weight Infants: A Systematic Review and Meta-analysis2022n=1,093

A meta-analysis of 8 trials (1,093 preterm or low birth weight infants) found enteral iron improved linear growth and reduced anemia without clear effects on infection, necrotizing enterocolitis, or cognition.

Effect: Benefit
Population: Preterm or low birth weight infants
Participants: 1,093

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RCTEnteral Iron Supplementation in Infants Born Extremely Preterm and its Positive Correlation with Neurodevelopment; Post Hoc Analysis of the Preterm Erythropoietin Neuroprotection Trial Randomized Controlled Trial2021n=692

Post-hoc analysis of 692 extremely preterm infants found higher cumulative enteral iron dose at 60 days was associated with better Bayley cognitive scores, especially among erythropoietin-treated infants.

Effect: Benefit
Dose: 2.1–5.8 mg/kg
Population: Infants
Participants: 692

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Algal OilView supplement →

Do not purchase★★★★★

How we scored this

Effect SizeVery Low / NoneEvidenceLowTrustMedium

Evidence Review

Giving DHA-enriched algal oil to breastfeeding mothers of very premature babies may help baby girls grow better, but not baby boys.
There was no effect on brain development by 18 to 22 months.

Browse 2 studies

RCTEffect of Maternal Docosahexaenoic Acid Supplementation on Very Preterm Infant Growth: Secondary Outcome of a Randomized Clinical Trial2022n=273

A secondary analysis in 273 very preterm breastfed infants found maternal DHA 1.2 g/day did not significantly alter neonatal growth velocity or weight at 36 weeks postmenstrual age versus placebo.

Effect: No Benefit
Duration: until 36 weeks postmenstrual age
Dose: 1.2 g/day
Population: Infants
Participants: 273

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RCTMaternal High-Dose DHA Supplementation and Neurodevelopment at 18–22 Months of Preterm Children2022n=234

An RCT in preterm infants found maternal high-dose DHA supplementation during lactation did not improve neurodevelopmental outcomes at 18–22 months corrected age versus placebo.

Effect: No Benefit
Duration: 18–22 months
Population: Children/adolescents
Participants: 234

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Vitamin DView supplement →

Do not purchase★★★★★

How we scored this

Effect SizeVery Low / NoneEvidenceLowTrustMedium

Evidence Review

In women at risk of giving birth prematurely before 34 weeks, getting a single vitamin D injection (50,000 IU) shortly before delivery lowered the chance their baby would have serious breathing problems needing special treatment.
It also improved the baby's health score 5 minutes after birth, but did not change other birth or hospital outcomes compared with no vitamin D.

Browse 1 study

RCTImplications of maternal vitamin D administration for the neonatal respiratory distress syndrome: A randomized clinical trial2024n=175

An RCT in 175 pregnant women at risk of preterm delivery found IM 25(OH)D 50,000 units before delivery did not significantly reduce neonatal respiratory distress syndrome versus no injection.

Effect: No Benefit
Dose: 50,000 units 25(OH)D IM
Population: Women
Participants: 175

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Evidence visualised

Same ratings as above, aggregated so you can see coverage and imbalance.

Purchase-guidance distribution

How many supplements fall in each purchase band

Effect-size distribution

How large the reported benefits tend to be

Study distribution across 3 supplements for prematurity (5 studies total).
Supplement	DEX	Studies	Meta-analyses	Share
Algal Oil	★★★★★32%	2	0	40%
Iron	★★★★★48%	2	1	40%
Vitamin D	★★★★★32%	1	0	20%

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Overview

Effect graph

Relevant supplements

Studies

Evidence visualised

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