I did do some zapping with Miracle-Mineral-Supplement but I had been using Miracle-Mineral-Supplement for a week or more before, building it up. I took the Miracle-Mineral-Supplement once or twice at lower doses and zapped 7-20-7-20-7 once also but I didn't do it more than a week and continued with the MMS at 15 drops once a day after, up to a month, then I resumed zapping after stopping MMS. I didn't get any bad reaction though. It was a 3 freq zapper not a beck type.