Only SENTÉ® skin care has HSA for ultimate skin hydration and renewal. Heparan Sulfate Analog (HSA) is unlike any other hydrating agent. It goes beyond surface hydration to revive skin’s natural renewal process. Exclusive to SENTÉ® skin care, HSA is clinically proven to diminish the appearance of wrinkles and improve skin tone texture. Ideal for aging sensitive skin, HSA helps preserve skin health, function, and appearance.