I am always looking for ways to grow thicker, healthier hair. On top of dermarolling my hairline and wearing red light hats, there’s one skin-care ingredient that’s quietly making the crossover to haircare that I can’t stop thinking about: exosomes. One of the buzziest regenerative skin-care ingredients, exosomes are what Ronda Farah, MD, associate professor in the department of dermatology at the University of Minnesota, describes as “communication vehicles” in our bodies.