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https://www.healthline.com/health/mthfr-gene

Multiple mutations of the MTHFR gene means that a lot of blanket statement health advice doesn't necessarily apply. It's also not all that uncommon, and it's something that most docs in the UK aren't familiar with. High incidence in Ashkenazi Jews (which I am).

In general:

https://en.wikipedia.org/wiki/Gene_polymorphism

And with respect to this gene:

https://www.ncbi.nlm.nih.gov/books/NBK6561/

And what's this "DNS test" which diagnosed it?

It doesn't "diagnose", you look at what the genes express in terms of alleles. Lots of information publicly available from reputable sources.

I'm not here to push recommendations of DNA services, but the better ones allow you to export your raw DNA data for further scrutiny if they don't allow you to just browse it by gene number via a web app. If you're interested, look it up. Likewise, watch out for the one that handled a security breach crappily recently.

It's always DNS!