What is an optimal Vitamin D level, and is the amount of 25 (OH)D in the blood really relevant in relation to your health?

In this post, you will learn about my experience from an experiment a couple of years ago (spoiler-alert … >140 ng/ml is NOT optimal!)

Further down on this page, you will also find the information from one of the authority sites on Vitamin D, Grassrootshealth, about the Vitamin D status among their members.


>140 ng/ml – a Painful Experiment

After having measured the level of vitamin D I get from exposure to the natual sun (79.01 ng/ml as described in this post How To Tan), and with the special Collatan+D hybrid lamps (96.7 ng/ml in this post), I decided to investigate what my level would be if I added Vitamin D supplement to my vitamin D tanning regime.


It became a very painful experiment.


Adding 5,000 IU’s of Vitamin D supplements every day for two weeks brought my 25 (OH)D level to above 140 ng/ml. How much above I don’t know since it was outside the scale of the measuring equipment (or its reporting system) as you can see in the scanned image below.


In 2020 I was (more or less voluntarily) “stuck” in Thailand for seven months due to COVID travel restriction. Returning to Moscow in September 2020, I decided not to make any efforts to boost my Vitamin D, neither with the help of sunbeds nor with oral supplements. (and, of course, not from the natural sun because of Vitamin D Winter)

When I measured my blood level of 25 (OH)D in March 2021, it had dropped to 36.4 ng/ml. See the scanned copy of test result below.

This means that during 6 months without exposure to sunlight, not using sunbeds, and not taking any vitamin D supplements, the level of vitamin D(25OH) in my blood had dropped from 79 to 36 ng/ml.


SOURCE: https://www.thetanningguru.com/vitamin-d/what-is-optimal-vitamin-d/