Maybe they have a different reason than what I explored at length in the case of America’s ban on Vegemite. It reads very similar to me at first glance:

It is unclear exactly why the Danish authorities have launched a crackdown on foods with too many vitamins.

But Marmite now joins the ranks of Australian alternative Vegemite, Horlicks, Ovaltine and Farley’s Rusks – all products the Danes have an apparent aversion to.

The anger expressed from the British seems to head towards the whole continent.

The ban highlights the absurdity of the EU which states that it is a legal product, but which has no authority over nation states about what can and cannot be sold.

I wouldn’t go so far as to say a Marmite ban highlights the absurdity of the EU.

It appears to be a situation where a state reserves the right to regulate a subset of the total legal products available to them. This is like if Kansas banned beer even though the US federal rules said beer is legal.

It highlights peculiar food and health standards in Denmark but does not appear to tarnish the relationship between Denmark and the EU.

At least you can still go to England and buy it…for now.