Polyglutamic acid vs hyaluronic acid: the new humectant with five times the holding capacity
A friend asked me last winter why her new polyglutamic acid serum, marketed as the “next-generation hyaluronic acid,” made her face feel…
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A friend asked me last winter why her new polyglutamic acid serum, marketed as the “next-generation hyaluronic acid,” made her face feel…
TL;DR: The ‘never mix acids and retinoids’ rule originated from skin-cycling logic and from concern that the low pH needed for AHA…
TL;DR: Tranexamic acid is a prescription antifibrinolytic drug, used in surgery to control bleeding, and used at five hundred to one thousand…
TL;DR: Mandelic acid has a molecular weight roughly twice that of glycolic, which sounds like a disadvantage and is actually the point.…
TL;DR: An open bottle of 15% L-ascorbic acid serum loses a meaningful percentage of its active dose within weeks, not months. The…