Hydration is fundamental to skin health, influencing barrier integrity, cellular function, and visible appearance. Poly‑γ‑glutamic acid (γ‑PGA), a biopolymer known for its exceptional water-binding capacity, offers new opportunities to enhance hydration beyond what traditional hyaluronic acid can achieve. This article investigates two γ‑PGA–based ingredients: AQUARICH^®‑MAX, a high–molecular‑weight film‑forming polymer that delivers immediate and long‑lasting surface hydration, and AQUARICH^®‑OLIGO, a low-molecular‑weight oligomer engineered for deep penetration and skin longevity benefits.