Polyglutamic Acid
PGA
BGood evidence (some RCTs)Safety: Safe
Chemical Function
Humectant that holds more water than hyaluronic acid.
Scientific Evidence
Studies show strong hydration and a film that reduces water loss.
Quality of EvidenceModerate
Interactions
Pairs beautifully with hyaluronic acid for layered hydration.
Pro-Aging Relevance
Deeper, longer hydration for drier mature skin.
The Science Behind Polyglutamic Acid
Polyglutamic acid is a humectant that can hold even more water than hyaluronic acid and forms a film that slows evaporation. Layered with HA it gives plump, lasting hydration.
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