The Effect of Vitamin D3 Supplementation on Vitamin D Status and Associated Health Outcomes in Children: A Randomized Controlled Trial.

What Was Tested

Researchers studied Vitamin D, K2, Magnesium and Zinc in this randomized controlled trial publication.

To examine the effect of vitamin D3 supplementation on vitamin D status and related health outcomes in children.

Why It Was Studied

Vitamin D is a key regulator of musculoskeletal growth, immune regulation, and cognitive function in children.

As children in the United Kingdom (UK) and Ireland are at risk of vitamin D deficiency due to the northern latitude, supplementation is recommended.

Who Took Part

PubMed indexes the participants as young children and children, both men and women.

The D vitamin in children study was a double-blind, randomized, placebo-controlled trial, conducted among healthy children (aged 4-11 y).

How the Study Was Run

In design terms this was a randomized, double-blind and placebo-controlled study.

The participants were allocated by chance, so the Vitamin D, K2, Magnesium and Zinc group and the comparison group should start out alike.

Neither the participants nor the staff measuring them knew who was on Vitamin D, K2, Magnesium and Zinc, so expectations could not easily colour the readings.

The comparison arm used a placebo, so changes seen with Vitamin D, K2, Magnesium and Zinc could be set against what happens without it.

The primary outcome, plasma 25-hydroxyvitamin D, and secondary outcomes, including grip strength, balance, cognitive function, winter status, immune markers, and bone turnover markers, were assessed pre- and postintervention.

What Was Measured

To their knowledge, the effect of supplementation on status and related health outcomes has not been investigated in children residing in the UK/Ireland.

PubMed files the paper under topics including Cholecalciferol, Dietary Supplements, Vitamin D, Vitamin D Deficiency, Ireland, Cognition and Biomarkers.

The authors tagged it with the keywords 25(OH)D status, balance, bone turnover markers, children, cognitive function and immune function.

What This Means in Plain Language

The paper is a randomized, double-blind and placebo-controlled study of Vitamin D, K2, Magnesium and Zinc.

The abstract goes on to report its results in about 6 sentences; this page does not restate them, so read the paper for the findings and their limits.

The publication is from 2026 (The Journal of nutrition), a journal based in United States.

More context: the Vitamin D, K2, Magnesium and Zinc compound page, all human trials.