I find I take a lot more magnesium and avoid all calcium when Earthing. And I take or eat extra C and extra fats too. They seem to be related. When I first did Earthing, I had heart palpitations (nothing new, I have had heart palpitations from several alternative therapies). I reduced the time first so I had just some releasing-energetic-sensation in my chest, and then so I had no symptoms in my chest. I could do 10 minutes each day. Now I am slowly increasing the time. I can do 20 min and 10 min alternating days. It's been about a month. My sense is that even the limited time is doing me some good; I know I really like doing the Earthing. As long as I take the magnesium I don't have other symptoms, so I figure that whatever clearing/healing the Earthing is doing requires more magnesium. That's okay.