Vitamin D Supplementation Causes a Decrease in Blood Cholesterol in Professional Rowers.

What Was Tested

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

In the skin vitamin D3 is synthesized from cholesterol, which leaves the question whether a feedback mechanism controlling the level of blood cholesterol exists.

Here the researchers investigate the effects of vitamin D3 supplementation on serum lipids in professional rowers.

Who Took Part

By PubMed's age tags, the people studied were young adults and adults.

How the Study Was Run

The researchers set it up as a randomized, double-blind and placebo-controlled study.

Because people in this Vitamin D, K2, Magnesium and Zinc study were split into groups at random, differences between the groups are less likely to reflect who happened to join each one.

As a double-blind Vitamin D, K2, Magnesium and Zinc study, the assignments were hidden from both participants and investigators until the end.

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

What Was Measured

In the skin vitamin D3 is synthesized from cholesterol, which leaves the question whether a feedback mechanism controlling the level of blood cholesterol exists.

Furthermore, maximal oxygen uptake was also measured at baseline.

Topics PubMed links to this paper include Adipose Tissue, Antioxidants, Athletes, Body Mass Index, Cholesterol, HDL, Cholesterol, LDL and Dietary Supplements.

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 publication is from 2016 (Journal of nutritional science and vitaminology), a journal based in Japan.

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