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It’s not your imagination. Whether you’re scanning the shelves of your local Sephora for newness to add to your rotation or swinging by your favorite neighborhood facial bar for a complexion refresh, exosomes are everywhere right now .

But what exactly are they? And in a world teeming with miracle ingredients, what do exosomes actually do?

For starters, it’s more accurate to describe an exosome as a “messenger” system derived from the human body than an isolated skin-care ingredient like, say, retinol or vitamin C. Naturally occurring in stem cells, umbilical cords and breast milk, exosomes distribute lipids, proteins and genetic mater

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