Polyglutamic Acid

How it works in skincare

In cosmetics and skincare, polyglutamic acid works as a superior humectant that attracts and binds large amounts of water from the atmosphere and within the upper layers of the skin. Its larger molecular size creates a protective, breathable film on the skin’s surface that reduces transepidermal water loss while allowing the skin to function naturally. Formulators often pair it with hyaluronic acid because the two work synergistically, with polyglutamic acid helping to keep smaller molecules in the skin for longer.

Key benefits

• Intensely hydrates the skin for up to 24 hours
• Helps plump the appearance of fine lines
• Improves skin softness and smoothness
• Strengthens the skin’s moisture barrier
• Enhances the performance of other active ingredients
• Provides a silky, non-sticky finish

Best for

dry skin, dehydrated skin, mature skin, sensitive skin

Where it comes from

Polyglutamic acid is a naturally occurring polymer most commonly derived from fermented soybeans through a natural bacterial fermentation process. It is produced by the same friendly bacteria used in the making of natto, a traditional Japanese fermented soya food.