Preserving an Alkaline Glycol-based DeodorantMy aluminum-free deodorant stick formula has the following ingredients:Propanediol, Magnesium Hydroxide, Glycerin, Aloe Vera Juice, Sodium Stearate, Behenyl Alcohol, Arrowroot Powder, Kaolin, Castor Oil, Hops Extract, Cetearyl Alcohol, Glyceryl Stearate, Essential Oils, Phenoxyethanol, Ethylhexylglycerin, and Sodium ChlorideBecause of the aloe vera juice and arrowroot starch, I have been using a preservative at 1% (phenoxyethanol and ethylhexylglycerin blend). I notice that many aluminum-free deodorants on the market have a similar ingredient list that includes botanicals, but most of them do not list a preservative. I’m now wondering if a preservative is necessary. My water phase plus botanicals make up less than 25% of the total formula, and the glycols make up more than 50%. Would the high percentage of glycols, combined with the pH of ~10 discourage the growth of microbes? Should I still use a preservative, and if so, is 1% necessary, or could it possibly be reduced?
Log in to reply.