A minute amount of Tetrasodium EDTA is used in our bar soaps as an anti-oxidising agent. We only use what is needed, which means it is present in the soaps at a concentration of 0.02% (one part per five thousand). At the moment it is the only viable preservation option. Without EDTA, our soaps would become rancid very quickly, however rest assured, we are always on the lookout for better alternatives.
The EWG score is a hazard score ranging from 1-2 (low hazard), 3-6 (moderate hazard) and 7-10 (high hazard) published by the Environmental Working Group. Their data is sourced from the Skin Deep® database and studies published in open scientific literature.