The most widely used natural-origin preservatives include glyceryl caprylate, ethylhexylglycerin, pentylene glycol, levulinic acid, p-anisic acid, and leuconostoc ferment filtrate. Antioxidant support — rosemary CO2 extract, tocopherol, and ascorbyl glucoside — is added in oil-containing formulas to prevent rancidity. The correct combination depends on your pH target, water activity, and certification requirements. A cosmetic chemist on AJ Cosmo Labs can recommend a validated stack for your specific formula type.
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