i change the preservative in my face cream

know i use geogard ect, but i see that pH is 3,8

i have to adjust ph with NaOH or sodium acetate??


  • If I understand your question correctly you are asking how to increase final pH in your product? (After adding Geogard ECT the pH dropped?) 

    If so, yes, you can use NaOH (30% solution for example) or other alkaline pH buffer. 
  • PhilGeisPhilGeis Member, Professional formulator
    what pH do you want to establish?
  • Yeah, good point @PhilGeis. I should have mention to be careful to keep the preservative in its functional pH. 
  • MarkBroussardMarkBroussard Member, Professional Chemist

    There is absolutely nothing wrong with pH 3.8 with this preservative.  Do you find the for some reason pH 3.8 is too low for your product for some reason?  I would leave well enough alone unless you have some really compelling reason to raise the pH above 3.8
    Chemist/Microbiologist formulating in the Organic & Naturals & Clean Beauty arena under ECOCert/Natural Products Assn/Whole Foods/National Organic Program/Clean At Sephora/Credo Clean guidelines focused skincare & haircare products. 

    See website for details
  • If you want to increase ph above 4.5, i would suggest add another anti fungal too or change preservative again. 

  • can i leave the pΗ for face cream at 3.8? Ι think it's better at 5

  • PhilGeisPhilGeis Member, Professional formulator
    Yes you can leave it at 3.8.  But why did you think you needed to increase it and to what pH?

  • i known that the ph of our face skin is 4,5-5,5
    that's why i want iti to be ph around 5

  • PhilGeisPhilGeis Member, Professional formulator
    Are you buffered?
  • what do you mean??

  • PhilGeisPhilGeis Member, Professional formulator
    Do ingredients in your formula hold the pH steady or is pH readily adjusted?
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