Dear all,
A preservative for cosmetic product can be revalidated and extended its expiry date
A reverification of its parameters as well as a challenge test of the finished product are sufficient to revalidate a preservative 
Best regards 


  • PhilGeisPhilGeis Member, Professional formulator
    Not aware the term 'revalidation" in this context.  ALL cosmetics should be marketed with challenge testing data justifying their microbiological safety through consumer use - tho' consumer can use stuff forever and do not respect ex dates - most major companies see three years in this regard and use "rapid ageing" of product to project preservative stability and efficacy.

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