What it is: A fast-acting serum with three retinol technologies to help visibly improve key signs of aging in as little as two weeks.What it does: This treatment features smart retinol technology that balances a fast-acting retinoid and delayed-release retinol for rapid results while still being gentle on the skin. It also delivers a dose of hydrating hyaluronic acid thanks to Murad's Retinol Tri-Active Technology, so common retinol issues such as dryness are a nonissue and the treatment is safe for nightly use.Research results:In an eight-week study with 84 female participants ages 35-65:- This product was clinically-tested and shown to improve visible aging signs after two weeks- This product was shown to visibly firm skin after two weeks- 92% of participants saw smoother skin after two weeks- This product was clinically-proven to visibly improve key signs of aging after four weeksHow to use: At night, apply a thin layer to your face and follow with a moisturizer. Reduce frequency if sensitivity occurs. 1 oz. Paraben-free; sulfate-free; phthalate-free Safe for sensitive skin Made in the USA