L-Ascorbic acid content in Vitamin C serum
I was told by a technical rep of an ingredient company that 10% L-ascorbic acid is to high for a serum and will cause “burning” in people with sensitive skin. I’ve seen that most products in the market contain at least 10% and haven’t seen any warnings about potential irritation or burning.
I will appreciate some input on this. Thank you in advance.
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