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Vitamin C serum sour
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.
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3 Replies
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Sorry the pH is actually 4.5-5.0
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You’ll have to include the full formula (ingredients and amounts) to get more help here
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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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