Polyglutamic Acid: 4x More Hydrating Than Hyaluronic Acid – Any Truth?
The claim has some basis in lab tests – polyglutamic acid (PGA) can bind 4,000-5,000x its weight in water versus hyaluronic acid’s (HA) 1,000x. But real skin performance tells a more nuanced story: PGA excels at surface retention while HA penetrates deeper. They’re complementary, not competitive.