Multivitamins for healthy children: what are the true benefits?
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It's doubtful that multivitamin with mineral (MVM) supplementation improves IQ in healthy, low-risk children (strength of recommendation [SOR]: B, conflicting randomized clinical trials [RCTs]). However, MVM supplementation decreased the incidence and severity of common infectious diseases among children in peri-urban India (SOR: B, RCT). Multivitamin (MV) use doesn't have consistently reported harms (SOR: C, conflicting cohort studies). An association between MV use and higher rates of asthma and food allergy has been reported, but studies conflict and any such effect is small.
Journal of Family Practice, 61(8) 2012: 508a-508b.