Member exclusive Q&A: Why are we using l-ascorbic acid in an oil based serum? Can it be used with niacinamide?

In the December Q&A, Carol asked: In regards to the Vitamin Packed Facial Serum found in your latest e-zine, if l-ascorbic acid is water soluble, how does it do in an oil serum?  The product I have is about the consistency of sand (not very soft) and I’m trying to find ways to use it up….

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