K-secret 1% retinal is a powerful yet relatively gentle alternative to prescription strength retinoids. Since retinal ( also known as retinaldehyde) works faster than retinol but is less irritating than tretinoin, it's a great choice for those looking to improve fine lines, wrinkles and skin texture without excessive dryness or peeling.
The serum itself has a lightweight texture and absorbs well into the skin without leaving a greasy feeling I noticed am improvement in skin smoothness and brightening within a few weeks. However,  since it's high-strength product, beginners should start slowing (2-3 times a week) and always use sunscreen during the day