this high-iq retinol serum expertly blends 4 different forms of retinoids with allosteris, a powerful retinoid amplifier, providing high-dose rejuvenation benefits without the downtime typically associated with retinol. the next step up from riq retinol 0.2, with our customizable potency and microencapsulation delivery system, actives are time-released into skin to ensure visible rejuvenation without the irritation.