See who your local INOLEX rep is. They have some great preservatives which under EC regulations allow you to class a product as "preservative free"! Zero parabens, which is in tune with customer fears...
I use Spectrastat in our creams and have excellent results. INCI: caprylhydroxamic acid (and) caprylyl glycol (and) glycerin
Aromastat is "preservative free" in the EC; INCI: caprylhydroxamic acid (and) phenethyl alcohol (and) glycerin
mail:
cheminfo@inolex.com to find your local distributor.
(I have no connection with Inolex except as a satisfied customer)