Peter Thomas Roth Pro Strength Series 3% Retinoid Serum Pro Strength for those who know they are ready for the next step in retinol treatments. Always a step up type schedule when introducing any new product for sure with retinol products. Peter Thomas Roth makes some of the best skincare in the biz to have you looking your best glowing self. This serum is for advanced benefits formulated with high potency fast acting encapsulated form of Vitamin A for maximum results over time. Helps diminish fine lines, wrinkles, acne scarring and other signs of aging. Worthy if it’s high price tag for the glow