Home Cosmetic Science Talk Formulating Advice preservative blend

  • Advice preservative blend

    Posted by Nyatou on March 2, 2024 at 6:34 am


    I usually buy preservative k (=euxyl k 700) which is not cheap and it´s not always in stock. I do have the ingredients at home so I was thinking about doing the blend myself. I would appreciate some feedback.

    What do you guys think of a blend of:

    0,3% phenoxy

    0,3% benzyl alcohol

    0,2 % potassium sorbate

    0,2% tocopherol

    plus 0,1% edta.

    Nyatou replied 1 month, 3 weeks ago 3 Members · 4 Replies
  • 4 Replies
  • PhilGeis

    March 2, 2024 at 7:27 am

    Good idea - but do not “blend”. Formulate as individual ingredients and, if pH allows, use Na benzoate rather than sorbate. Doubt you really need the tocopherol.

  • Nyatou

    March 2, 2024 at 10:44 am

    Thanks for the help @phil . It means a lot.

  • Graillotion

    March 2, 2024 at 12:19 pm

    Not that I should ever add on to a Dr Phil comment…but two of the ingredients, performance will be very tied to pH…which you did not mention. 🙂

    • Nyatou

      March 2, 2024 at 12:44 pm

      pH is 5 for a body cream @Graillotion

      Is it ok for sodium benzo?

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