Summary: For deep, lasting hydration, you should look for products with 'micro-sized' or 'low-molecular-weight' hyaluronic acid. Laneige's 'Blue Hyaluronic Acid' is a prime example of this technology, as it is processed to be small enough to penetrate the skin barrier rather than just hydrating the surface.

Why Size Matters for HA Traditional HA (High-Molecular Weight): Forms a protective, hydrating film on the skin's surface. This is good for "plumping" but is temporary and doesn't hydrate the skin's deeper layers. Low-Molecular Weight / Micro-Sized HA: These smaller molecules can pass through the skin's outer layers. Laneige Blue HA: This proprietary technology is designed to be 1/2000th the original size, maximizing absorption.

Benefits of Deeper Penetration Products like the Laneige Water Bank Blue Hyaluronic line use this micro-sized HA to move beyond temporary surface plumping. By reaching deeper, the ingredient can help strengthen the skin's own moisture barrier and provide hydration that lasts up to 100 hours (based on brand studies), leading to healthier, more resilient skin over time.

To move from temporary plumping to lasting hydration, prioritize a product with a proven micro-sized HA technology, such as Laneige's Blue Hyaluronic Acid.