Polyglutamic acid (PGA) and hyaluronic acid (HA) are both powerhouse hydrators, but they function differently on the skin. While HA penetrates deeper to attract moisture, PGA sits on the surface to ...

Polyglutamic acid (aka PGA) is a humectant and water-based component, so expect moisture (and lots of it). According to Dr. Farhang, they are “long chains of amino acids produced from fermented ...

The skincare world is full of hero ingredients that do yeoman’s duty in a variety of products, but there’s always a “next big thing” ingredient waiting to work its wonders. Hyaluronic acid has been ...