As Brown explains, there’s multiple of reasons why someone might opt to use a fragrance-free shampoo versus a scented one. “For some, it’s because they love the smell of their own perfume and don’t want it to compete with their hair, while for others, it’s a matter of sensitivity to smell or even sensitivity to the skin,” she says. “Additionally, some may just want to use a product that isn’t loaded with artificial scents for the sake of keeping the unnecessary out of their beauty products.”

According to Rubin, there’s a growing number of people with allergies or sensitivity to fragrance.

“This can appear as contact dermatitis, with an itchy, red rash—and yes, natural fragrance can cause skin allergies as well,” she says. “Some fragrance can also cause migraines to flare so this is another reason why some people may avoid them.”

Additionally, Rubin says some may choose to steer clear of scented shampoos due to their work environment—such as in medical settings—where fragrance is generally forbidden. Specific reasons aside, using a scent-free shampoo can be extremely beneficial for those with sensitive skin or allergies to fragrance.