Home Cosmetic Science Talk Formulating how to fix drifting pH

  • how to fix drifting pH

    Posted by chequere on June 13, 2024 at 4:27 pm

    Hello! I am a DIY formulator. I have created serums and toners, which work great, but I have noticed pH drifting regardless of the formulation/ingredients. I have tried preserving the formulas with Geogard ECT and the combination of Lactobacillus Ferment (Leucidal liquid SM Max) with Lactobacillus (and) Cocos Nucifera (Coconut) Fruit Extract (AMTicide Coconut). The pH drifts slowly over several weeks. I read somewhere that adding L-Arginine would help to stabilize the pH, and I tried that (I’m not sure if I’m doing it correctly), but the pH drift is still occurring. Could someone please share with me how to prevent this from occurring? Thank you very much!

    chequere replied 1 week, 4 days ago 3 Members · 4 Replies
  • 4 Replies
  • Graillotion

    Member
    June 13, 2024 at 9:39 pm

    You have not listed any credible preservatives. You may need to hit rewind….and consider better preservatives.

    Preservative Reviews - (makingskincare.com)

    Things that maintain pH are called buffers. Things like Arginine will alter pH to a desired point, but generally will not continue to hold them in place like a buffer.

    I would consider starting with better preservatives, and seeing if the pH drift continues. I assume you are using a meter to take these readings?

    When discussing a topic like this…we need more information. Things like is urea in the product or gluconolactone…etc…etc… It is very hard to address a concern…when lots of guessing is involved. (You did not even tell us which way the pH is drifting. 😉 )

    Good Luck.

    • chequere

      Member
      July 6, 2024 at 12:04 pm

      Thank you! Sorry for not including more information. The Ph drifts down over time. None of the products that I have made include urea or gluconolactone. Thanks for your help!

  • hidden-123

    Member
    June 14, 2024 at 5:44 am

    If there is a drift in the pH, the possible reasons could

    * Check for the TDS and the pH of the water.

    * Check for good Chelating agents and preservatives.

    • chequere

      Member
      July 6, 2024 at 12:11 pm

      Thank you very much! I have used Sodium Phytate on some of the products. The pH seems to drift down on all products (with and without sodium phytate). I will check the pH of the water.

      I will also try to add a pH buffer solution with sodium citrate and citric acid. Should the pH on the pH buffer solution be in the target range that I want for the product? (e.g. if pH target range for a product is 4.8 - 5.3, what should the pH for the pH buffer solution be?). Thank you very much for your help!

Log in to reply.