Here is the list of preservatives and preservative boosters (not counting antioxidants) that we are currently using in our products: Caprylhydroxamic acid, ethylhexylglycerin, gluconolactone, phenoxyethanol, salicylic acid, potassium sorbate, sodium benzoate, and chlorphenesin.The use percentage ranges from 0.01 to 2%, depending on the ingredient and product.