Yes — arguably even more so. Natural preservation systems (rosemary extract, glycols, fermented ingredients) are frequently challenged by regulators and retail buyers because their efficacy is less predictable than traditional preservatives. A passing PET certificate is the only objective evidence that your system works. AJ Cosmo Labs lists labs experienced with natural and 'free-from' formulation claims who can help you build a compliant regulatory dossier.
Read the full guide on Preservative efficacy testing →