“Hyaluronic acid helps decrease and manage frizz and seal split ends, resulting in fuller and overall shinier hair and a balanced and hydrated scalp,” says Shab Reslan, a trichologist and hair

Hill explains that by soaking moisture into the hair, hyaluronic acid can also improve the porosity of hair (or its ability to absorb water). Damaged hair usually has a high porosity, which means that water exits too quickly from the hair to maintain hydration. With hyaluronic acid, “improving the hydration can help improve the porosity of the hair,” says Hill.

What about hair loss? While Reslan and Hill both agree that hyaluronic acid won’t prevent or curb hair loss, it can help make sure hair is healthy. “It can, however, potentially alleviate breakage because dry hair is frizzy and fragile,” says Hill.