I have many autoimmune issues with SLE. Also Afib. due to valve irregularities. Probably PMR too. I've been grounding for the last few years. Where I live, it is too cold most of the year for natural grounding, so I use the Earthing Institutes mats. I have one in my bed and one in my office. I think it has been very helpful in keeping all of my symptoms at mild. It just feels good and right. No risks. ( except what I've just learned here about the blood thinner issue ) I take apixaban, so I will ask my cardio next time I see him.
Bottom line, it is natural and yes, that was a really good documentary!