“HA is well known for its ability to bind large amounts of water, acting as a powerful humectant,” says Dr. Gohara.

From an ultra-hydrating serum to a hair gloss reviving dry strands, browse all the beauty buys InStyle editors are loving ...

Cast your mind back to 2017, when The Ordinary launched its serum foundation. Costing less than £6 (at the time) and with ...