Not yet investigated
What we have so far
The form that skips MTHFR entirely. Worth having — and it is sold to people whose folate status was never measured in the first place.
This star is on the map because the show intends to take the question apart properly — the trials, how it is actually tested, whether the thing sold is the thing studied. That work is not done yet, and nothing here should be read as a conclusion. When the investigation is published it will appear on this page.