Exosomes are suddenly everywhere. Difficult to pronounce yet impressive in its efficacy, this buzzy ingredient is popping up all over the beauty aisle. Exosome-containing skincare products often promise a boost in collagen production and skin regeneration—the process of damaged tissue being replaced by new, healthy tissue. In hair-thinning remedies, they can supposedly kick hair follicles into the active-growth phase.

For decades, Retin-A (tretinoin), Rogaine (minoxidil), and Botox (botulinum toxin) were among the only treatments FDA-approved to treat signs of aging and hair loss—and for most people, they work. In the last few years, though, innovations in the worlds of over-the-counter skincare, haircare, and regenerative cosmetic procedures have seen an inundation of promising ingredien

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