What is the percentage of retinol in the Enzyme-Active Retinol Serum? Is it for beginners or experienced users?Updated a year ago

The Enzyme-Active Retinol Serum contains 0.1% retinal, which is estimated to be 20 times stronger than retinol. Studies show that at 0.05% to 0.1%, retinaldehyde can effectively reduce skin roughness and signs of aging without irritating the skin.