I do not quite understand the angle here. My impression is that they want to prevent accidental Vit D overdose by labelling products that contain it more aggressively, but I'm not sure?
Lot of people have Vit D Deficiency, yet others say in the US doctors don't understand it and loose their license by recommending it? But it seems to just be legal problems with labeling?
What exactly is going on here.
I was under the impression the absorption rate was so low, that it would take a massive oral ingestion to be concerning?
>Cases of vitamin D overdose have recently been reported in young children following the use of food supplements fortified with this vitamin. These cases present as hypercalcaemia (excessive calcium in the blood), which can have serious consequences on the kidneys such as lithiasis or nephrocalcinosis (calcium deposition in the kidneys).
https://www.anses.fr/en/content/vitamin-d-children-use-medic...
This resulted in multiple bouts of kidney stones, which I can wholeheartedly not recommend.
I don't take vitamin D supplements anymore.
Basically all vitamins and minerals have very complex interactions, and if you start taking megadoses of one, then it can surprising effects like:
* Cause accelerated utilization of a co-vitamin, causing low levels in these, and rendering the megadoses vitamin ineffective.
* Block or bypass the pathways that utilize a vitamin, causing to high a levels of another vitamin.
* Rendering measurably normal levels of a vitamin ineffective, through competition or exhaustion of the resources the secondary vitamin relies on.
B vitamins for example have complex interactions with each other. I cannot offhand remember the specifics, but if I recall correctly things like “energy” drinks stuffed with megadoses of a vitamin can result in the symptoms of deficiency of another B vitamin despite having normal levels.