Technically yes, but it is strongly inadvisable. PET results are only valid for the exact formula submitted — any change to pH, water phase concentration, preservative level, or chelator after testing invalidates the result and requires a full retest. Work with a cosmetic chemist to finalize your preservative system before submitting samples. You can find experienced formulators and accredited labs together on the AJ Cosmo Labs platform.
Read the full guide on Preservative efficacy testing →