Effects of One Year of Vitamin D and Marine Omega-3 Fatty Acid Supplementation on Biomarkers of Systemic Inflammation in Older US Adults.

What Was Tested

This randomized controlled trial looks at Vitamin D, K2, Magnesium and Zinc.

However, past trials have been inconsistent.

Who Took Part

The abstract describes 2 women taking part.

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

The researchers assessed changes in interleukin (IL)-6, tumor necrosis factor receptor 2 (TNFR2), and high-sensitivity C-reactive protein (hsCRP) concentrations from baseline to 1 year among participants randomized to vitamin D + n-3 FA (392), vitamin D (392), n-3 FA (392), or placebo only (385).

How the Study Was Run

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

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

A placebo (an inactive look-alike) gave the Vitamin D, K2, Magnesium and Zinc group a baseline to be compared against.

Geometric means and percent changes were compared, adjusting for baseline factors.

What Was Measured

PubMed files the paper under topics including Biomarkers, C-Reactive Protein, Dietary Supplements, Fatty Acids, Omega-6, Inflammation, Interleukin-6 and Longitudinal Studies.

What This Means in Plain Language

The paper is a randomized, double-blind and placebo-controlled study of Vitamin D, K2, Magnesium and Zinc in 2 women.

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.

The abstract goes on to report its results in about 7 sentences; this page does not restate them, so read the paper for the findings and their limits.

The publication is from 2019 (Clinical chemistry), a journal based in England.

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