compatibility of phenoxyethanol and p-anisic acid

Hi there! I am having a little bit of trouble with using these two preservatives together. i thought they would be excellent with each other but it seems like from my experiments and trials, they aren't great together. Was just wondering if any one could explain to me why they don't go together?


  • ozgirlozgirl Member, PCF student
    What type of product are you making? What is the problem they are causing?

    These ingredients are used together in Johnson's baby lotion (with some other multi-functional preservative/antioxidant ingredients) which strongly suggests that they can be used used together.

    Have you tried adding each raw material separately to see if it is just one of the ingredients that causes your problem rather than the combination?
  • i have trouble with bentonite gels and surfactant type formulas.

    with the bentonite gels, i am using 0.2% panisic acid and 1% phenoxy and it is failing my microbial tests. i tried it in a face cream and that combination was fine but it didn;t give me the same result in the bentonite gels

    with my surfactant formulas, they are crashing out the viscosity and makes it go really thin after 2 -3 weeks! it is a simple ALS body wash formula. Using just phenoxy is fine for viscosity but i was just trying to boost the  preservative system.... 
  • MarkBroussardMarkBroussard Member, Professional Chemist
    I would suspect the pH of your bentonite gel and body wash formulation are each above 6.0?  Perhaps a Phenoxyethanol/Caprylyl Glycol blend using 1,3-Propanediol as a booster would be more effective.
    Chemist/Microbiologist formulating in the Organic & Naturals arena under ECOCert/Natural Products Assn/Whole Foods/National Organic Program guidelines focused skincare & haircare products. 

    See website for details
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