Shop Ahava pRetinol Serum, 1.01-oz. online at Macys.com. This anti-wrinkle facial serum brings youth and radiance back to skin, sheds dullness and delivers vitality and luminosity to your everyday appearance. Ahava's unique patented complex utilizes the revolutionary beta-carotene pre-retinol properties of the Dunaliella salina Dead Sea alga, a retinol source from nature.