Home Cosmetic Science Talk Formulating Vitamin C serum sour

  • Vitamin C serum sour

    Posted by Annyeap on January 10, 2021 at 3:44 pm

    I have a L Ascorbic Acid serum that smells sour. it has been buffered properly and pH is 4.0-4.5. the colour has not changed, it is still colourless. I am wondering why has it gone sour. 

    microformulation replied 3 years, 2 months ago 3 Members · 3 Replies
  • 3 Replies
  • Annyeap

    Member
    January 11, 2021 at 12:16 am

    Sorry the pH is actually 4.5-5.0

  • EVchem

    Member
    January 11, 2021 at 3:57 pm

    You’ll have to include the full formula (ingredients and amounts) to get more help here

  • microformulation

    Member
    January 11, 2021 at 11:09 pm
    You would have to include the whole Formula for any substantial help, but my guess is the L-Ascorbic Acid has oxidized. It can present as changes in color and/or odor. I would suggest using a more stable derivative.

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