Anhydrous formula question about preservation


So I have about 33% guar gum in my anhydrous shampoo (in addition to all my other surfs, etc). Is that bad? Let's say it gets wet in the shower...will stuff start growing? I am using Benzyl Alchohol + DHA + a bit of KaSorbate as preservatives but afraid it's not enough. 


  • PhilGeisPhilGeis Member, Professional formulator
    Is this a bar?

  • PerryPerry Administrator, Professional Chemist
    This sounds like a solid product?
  • hi! Yes it is a solid product. I know people say solid products don't need preservatives but I mean...I'm got a lot of guar gum in mine...

    I actually don't understand why people say bars don't need preservatives?? That stuff gets wet all the time! 
  • PhilGeisPhilGeis Member, Professional formulator
    Of course it gets wet - that doesn't mean you need to preserve a film of water.  You can't preserve water pools around the bar,.  Think your wasting your money on preservation.  
    Does the get get mushy?
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