Just like hyaluronic acid, Polyglutamic acid is a humectant. According to Elyse Love, MD, a board-certified dermatologist, that means the ingredient draws moisture into the skin when it is paired with a moisturizer. “This leads to increased skin hydration and improvement in the appearance of dullness and fine wrinkles,” she explains. “It is a great ingredient for anyone who wants extra hydration to the skin, especially those who struggle with dull and/or dehydrated skin. It plays well with almost all other skin ingredients and works well for all skin types.”

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