The Lubbers study indicated that chlorine dioxide was safe over a period of 12 weeks at a concentration of 5 PPM.
A pulp mill worker was killed in a plant accident where the concentration was estimated to be 19 PPM.
A 3 drop dose of Miracle-Mineral-Supplement has a gross concentration of 316 PPM and an effective concentration of 189 PPM. There are no studies on ingesting those concentrations.