Are you sleeping on a skin-care hit? From what the Vogue beauty team has heard, a certain growth factor serum we love has attracted plenty of celebrity admirers, including the likes of Martha Stewart, Naomi Campbell, and Rose Byrne. Elizabeth Olsen requested a restock from her most recent film set, and the product will soon cameo in the new season of Emily in Paris thanks to Aurelie Payne, the show’s lead makeup artist. Meet the Bioeffect EGF Serum, part of an insider-approved Icelandic skin-care line that turns 15 this year. Since discovering barley-derived EGF (epidermal growth factor) technology in 2005, the brand has bottled the skin-replenishing ingredient into a best-selling, beauty editor-beloved sensation.

“It’s truly magic,” says Dr. Sigrun Dogg Gudjonsdottir, MD, a board-c

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