Enzyme-Active Retinol SerumAn entire skincare routine in a single bottle. This award winning serum captures the most gentle and effective form retinol on Earth (retinal)estimated by dermatologists to be 20x more effective than regular retinol. This elusive ingredient is captured using Protocol's patented oxygen free bottling technology, designed by the Protocol Lab Team in collaboration with aerospace engineers. Most clients see improvements within 10 days. Formulation and