Impact of body composition on vitamin D requirements in healthy adults with vitamin D deficiency.

What Was Tested

The paper reports a study of Vitamin D, K2, Magnesium and Zinc, published as a randomized controlled trial.

The aim of this study was to determine which body components affect the bioavailability of vitamin D.

Why It Was Studied

However, it is unclear which specific body composition is the determining factor affecting the bioavailability of vitamin D after supplementation.

Who Took Part

The study group was 20 subjects.

By PubMed's age tags, the people studied were young adults, adults and middle-aged adults, both men and women.

In order to ensure the compliance of the study subjects and avoid the impact of sunlight on vitamin D3 levels, the subjects received multiple intramuscular (i.m.) injections of vitamin D2 until their serum levels of 25-hydroxyvitamin D [25(OH)D] were above 30 ng/mL.

How the Study Was Run

The researchers set it up as a randomized study.

Random assignment meant chance, not the researchers, decided who got Vitamin D, K2, Magnesium and Zinc and who got the comparison, which limits bias.

The levels of serum 25(OH)D2 and 25(OH)D3 were determined by liquid chromatography tandem mass spectrometry.

The body composition was measured using dual-energy X-ray absorptiometry and corrected using body fat mass index (FMI).

What Was Measured

PubMed files the paper under topics including Biological Availability, Body Composition, Body Mass Index, Dietary Supplements, Vitamin D and Vitamin D Deficiency.

Author keywords: body fat, nutrition, vitamin D bioavailability and vitamin D supplementation.

What This Means in Plain Language

The paper is a randomized study of Vitamin D, K2, Magnesium and Zinc in 20 subjects.

With fewer than 40 people, it is a small study, so it is better read as an early signal for further research than as a settled answer.

Its findings take up roughly 6 sentences of the abstract and are left out here on purpose; the source paper is the place to read them.

The publication is from 2025 (Frontiers in endocrinology), a journal based in Switzerland.

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