According to board-certified dermatologist and founder of Facet Dermatology, Geeta Yadav, MD, caffeine offers multiple benefits to the hair and scalp. First, it functions as an antioxidant. “As an antioxidant, it helps defend hair and scalp from free radical damage, allowing for smoother, shinier, and healthier-looking hair,” she says.
That being said, she admits that the “most interesting” benefit is that it can help with hair growth, which it does by stimulating and actually enhancing blood flow. “In a study, caffeine showed the ability to improve skin barrier function, stimulate blood circulation, and promote new hair growth. It also inhibits phosphodiesterase, which means it can enhance blood flow, too, making for an excellent foundation for healthier hair growth.”
Why is blood flow important, According to Brendan Camp, MD, double board-certified dermatologist, “Better blood circulation on the scalp may improve oxygenation and the delivery of nutrients to hair follicles.” In turn, “Improved oxygenation and delivery of vitamins and nutrients to hair follicles may reduce the impact of oxidative stress on hair follicles. Oxidative stress refers to the damage caused by free oxygen radicals, which can have a negative effect on cellular structures.” In other words, more blood flow means more nutrients and less damage to hair follicles. And as we all know, happy hair follicles result in strong, shiny hair.