Cosmetic Microbiologist Here. I Can Help Answer Your Germ Questions



  • BobzchemistBobzchemist Member, PCF student

    Here's the thing - every single formula is different. There is NO way to tell if you have an adequate preservative system just from formula information, even if you listed the entire formulation. The ONLY acceptable way to determine this is with a preservative efficacy test, otherwise known as a microbial challenge test. Anybody who tells you otherwise is lying to you.
    Robert Zonis, Sr. Formulation Chemist, Beaumont Products "All opinions and comments expressed are my own, have no relation to Beaumont Products, are fully copyrighted, and may not be used without written permission."
  • Thank You. I figured as we always do perform challenge testing but just wanted to ask since I am adjusting this formula and I am used to using other preservative systems.
    Thank You for your input.
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