Preservatives that are generally considered compatible include ethylhexylglycerin, phenoxyethanol at 0.5–1%, sodium benzoate paired with appropriate pH, and multifunctional humectants like 1,2-hexanediol. Preservatives like methylisothiazolinone and formaldehyde-releasing agents are typically avoided. A cosmetic chemist sourced through AJ Cosmo Labs can recommend a preservative system that passes PET and supports your claim.
Read the full guide on how to find a formulator for microbiome friendly moisturizer →