Home Cosmetic Science Talk Formulating General Cosmetic Microbiologist Here. I Can Help Answer Your Germ Questions

  • Bobzchemist

    September 8, 2015 at 1:28 pm


    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.
  • mart

    September 8, 2015 at 6:08 pm

    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.

  • Loretta

    July 19, 2023 at 8:20 am

    Hello Ben, I know this is an older post, but do you have the Capability to test a product for any benzenes, or harsh chemicals. After reading this, I think I want some products tested. Do you offer this?

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