I'm new and still don't know much about preservatives but I copied this off of the Presevative Information link. HTH. Germaben II INCI: Propylene Glycol (and) Diazolidinyl Urea (and) Methylparaben (and) Propylparaben Can be used with no co-preservatives and is compatible with most cosmetic ingredients. Use Germaben II when making emulsions that have 25% oil or less. Add slowly below 60F (140F) after good stirring just prior to the addition of fragrance. pH restrictions – 3.0-7.5 Is a complete preservative in that it covers microbial, fungus, and yeast. Usage level - .5-1.0%