Zinc use in paediatrics according to recent articles
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I now have comprehensive, up-to-date information from multiple systematic reviews, meta-analyses, the 2024 WHO guideline update, and textbook sources. Here is the full synthesis:
Zinc Use in Paediatrics: Evidence from Recent Literature
1. Role of Zinc in Childhood Health
Zinc is an essential trace element with wide-ranging functions in children: it supports normal growth, intestinal mucosal integrity, immune competence, wound healing, synthesis of testicular hormones, and resistance to infection. Because zinc intake tracks closely with protein intake, deficiency is common in resource-limited settings and contributes substantially to childhood morbidity globally.
Clinical features of zinc deficiency (from textbook and Nutrients 2023):
- Mild: growth retardation, feeding difficulties, poor appetite
- Moderate-severe: growth arrest, diarrhoea, acrodermatitis (periorificial/acral dermatitis), alopecia, dysgeusia, hypogonadism, impaired wound healing, glucosuria, corneal clouding
- Children with inflammatory bowel disease (IBD), coeliac disease, and those on long-term proton pump inhibitors are particularly susceptible - Goldman-Cecil Medicine
2. Zinc in Acute and Persistent Diarrhoea (KEY UPDATE)
This is the most evidence-rich and clinically impactful area. A 2024 WHO-commissioned systematic review and meta-analysis (Ali et al., J Glob Health 2024) of 38 RCTs found:
- Acute diarrhoea: Zinc supplementation increased recovery (RR 1.07; 95% CI 1.03-1.10; moderate certainty) and reduced duration by ~13.3 hours (MD -13.27 h; 95% CI -17.66 to -8.89; moderate certainty)
- Persistent diarrhoea: Zinc increased recovery rates (RR 1.75; 95% CI 1.34-2.30; low certainty - high heterogeneity)
- Key safety signal: Zinc caused significantly more vomiting vs. placebo (RR 1.46; 95% CI 1.22-1.76), but low-dose zinc caused less vomiting than high-dose (RR 0.80; 95% CI 0.72-0.89)
2024 WHO Guideline Update (Major Change)
An update to WHO childhood diarrhoea recommendations (Kundu et al., Indian Pediatrics 2025) represents a significant revision:
The 2024 WHO guidelines conditionally recommend a REDUCED zinc dose of 5 mg/day for up to 14 days for children up to 10 years with acute watery or persistent diarrhoea - down from the prior recommendation of 20 mg/day (children >6 months) - specifically to reduce vomiting while preserving therapeutic benefit.
This replaces the older standard of 20 mg/day elemental zinc for 10-14 days that appeared in earlier guidelines and most textbooks.
3. Zinc and Child Growth (Anthropometrics)
A systematic review and meta-analysis by Monfared et al. (BMC Pediatrics 2023) pooled 8 studies (n=1,586 healthy children >2 years):
- Zinc supplementation significantly increased height (WMD +0.9 cm; 95% CI 0.27-1.52)
- Significantly increased weight (WMD +0.51 kg; 95% CI 0.06-0.97)
- Significantly improved height-for-age Z-score (HAZ) (WMD +0.07; 95% CI 0.03-0.10)
- Meta-regression found no significant association between dose or duration and the anthropometric effect, suggesting even modest supplementation yields growth benefit
4. Zinc in Paediatric Gastrointestinal Diseases
A systematic review by Chao (Nutrients 2023) reviewed zinc deficiency and its treatment across paediatric GI conditions:
| Condition | Evidence Summary |
|---|---|
| Acute/persistent infectious diarrhoea | Well-established benefit; reduces duration (see above) |
| IBD (Crohn's, UC) | ZD common due to poor intake + malabsorption + intestinal losses; supplementation plausible but no specific paediatric guidelines |
| Coeliac disease | ZD prevalent; gluten-free diet improves status but supplementation may still be needed |
| Peptic ulcer / GERD | Zinc appears gastroprotective; evidence mostly adult data |
| Long-term PPI use | ZD risk elevated; monitoring recommended |
Key point: No specific zinc supplementation guidelines exist for paediatric IBD or coeliac disease; clinical practice is individualised.
5. Zinc in Acute Respiratory Infections
A systematic review and meta-analysis by Milani et al. (Allergy 2024; EAACI taskforce) covering 50 RCTs found:
- Pneumonia: Zinc supplementation showed a limited benefit in reducing hospital length of stay but NOT time to clinical recovery
- No dietary or nutritional intervention (including zinc) can currently be recommended for routine treatment of paediatric respiratory infections as a blanket policy
- Evidence is predominantly from lower-middle income countries; data from high-income countries are very sparse
- The evidence for zinc in common colds (Cochrane 2024, CD014914) similarly shows modest effect but significant heterogeneity
6. Zinc in Preterm/Low Birth Weight Infants
A systematic review by Liu et al. (Maternal & Child Nutrition 2025) examined enteral micronutrient supplementation in preterm/LBW infants:
- Overall, enteral micronutrients showed little benefit for neurodevelopmental outcomes
- Notably, zinc supplementation specifically improved fine motor scores (SMD 1.70; 95% CI 0.98-2.43) in subgroup analysis
- Current practice (e.g., NSW ANMF 2024): elemental zinc 2-3 mg/kg/day (up to 6 mg/kg/day) orally for preterm infants <32 weeks or <1,800 g; start after day 7 once on >50% enteral feeds; continue to 42 weeks corrected gestational age
7. Acrodermatitis Enteropathica (AE)
A 2025 literature review by Cui et al. (Frontiers in Nutrition) of 231 paediatric AE cases found:
- Zinc deficiency confirmed in 75.9% of cases
- Of 174 patients receiving zinc supplementation at various doses, 91.4% showed therapeutic efficacy
- The most commonly effective dose: 1-3 mg/kg/day elemental zinc
- Important: zinc supplementation was frequently ineffective in AE associated with metabolic disorders - underlying metabolic perturbations must be addressed concurrently
- There is still no consensus on optimal dosing for hereditary vs. acquired AE
8. Dosage Reference Summary (2024/2025)
| Indication | Recommended Dose | Duration | Source |
|---|---|---|---|
| Acute/persistent diarrhoea (≤10 yr) | 5 mg/day elemental zinc | Up to 14 days | 2024 WHO guideline (updated) |
| Acrodermatitis enteropathica | 1-3 mg/kg/day | Ongoing (lifelong in hereditary) | Cui et al. 2025 |
| Preterm/LBW infants (<32 wk) | 2-3 mg/kg/day (up to 6) | To 42 wk corrected GA | ANMF 2024 |
| Growth promotion (preventive) | 10-20 mg/day elemental | Varies by study | Monfared et al. 2023 |
| Diarrhoea prevention (malnourished) | 20 mg elemental zinc once daily | Preventive course | Goldman-Cecil Medicine |
Note: The older WHO recommendation of 20 mg/day for diarrhoea in children >6 months has been revised downward to 5 mg/day in the 2024 WHO update, based on the evidence that lower doses preserve efficacy while significantly reducing vomiting.
9. Safety Considerations
- Vomiting is the main adverse effect and is dose-dependent (less at 5 mg vs. 20 mg/day)
- Prolonged high-dose zinc can cause copper deficiency (competitive absorption at intestinal level) - Goldman-Cecil Medicine
- In AE with metabolic comorbidities, standard zinc supplementation may be ineffective without addressing the underlying disorder
- Both deficiency AND excess zinc can impair growth and cause GI symptoms - a therapeutic window applies
Key clinical takeaway: The major recent development is the 2024 WHO downward dose revision for zinc in childhood diarrhoea (5 mg/day from 20 mg/day), supported by robust meta-analytic evidence showing equivalent efficacy with significantly less vomiting at lower doses. Zinc's role in growth promotion is well-established; its role in respiratory infections is present but modest and not sufficient for routine recommendation outside of high-risk/deficient populations.
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