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.
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?