Geek & Gorgeous A-Game 10 Is A Serum That Contains A Medium Concentration of Retinal of 0.1%. Retinal is the "Big Brother" Molecule of the Better-Known Anti-Aging Superstar, Retinol. While Retinol Needs Two Metabolic Conversion Steps to Reach The Active Form, Retinoic Acid (aka Tretinoin), Retinal is the Direct Precursor, With Only One Conversion Step Away from the Active Form that Skin Cells Understand. It is estimated that retinal can convert more than 10 hours faster to retinoic acid than retinol, making retinal an excellently effective member of the retinoid family (vitamin a family). Particularly suitable for anti-aging Free of Perfume, Essential Oils, Sulfates, Silicone, Alchol, and Parabens. 30 ml. if your skin is sensitive, Start Using A-Game Slowly (Every Other Day) and Build Up A Tolerance Over Time. After Approx. For Two Weeks You Can Try Using It Every Night. You can try using a-game around the eye area, but be careful not to rub it into your eyes.