Not yet investigated
What we have so far
Over 90% of adults carry it. A ten-million-person military cohort put it upstream of multiple sclerosis with a 32-fold increase in risk.
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.