All of the experts recommended looking for gentle hydrating ingredients, like hyaluronic acid and collagen, while avoiding harsh products that may cause irritation.
Nourian notes, "Both [hyaluronic acid and collagen] help draw hydration to the top level of the skin to naturally plump and define lips. Avoid harsh ingredients like peppermint oil and cinnamon, as these ingredients work to boost lip shape by irritating the skin to increase blood flow to the surface. These irritants are doing more harm than good."