pH adjuster for mouthwash
Hi guys, I am formulating a natural herbal mouthwash and the preservative I am using is Gluconolactone & Sodium Benzoate Ecocert.. I was using citric acid as a pH adjuster because I need to get it down to 6 in order for the preservative to be effective, but it turns out there is a contraindication for using these together since it will oxidize the sodium benzoate converting it to Benzoic acid. I am looking for another way to lower my pH int his formulation. It will have to be food grade, any suggestions? would acetic acid work??