ISDIN Retinal Intense SerumISDIN Retinal Intense Serum is a dual phase serum that helps reduce wrinkles, refine texture, improve firmness, and even out skin tone while supporting skins natural overnight repair. This advanced night time powered by Retinaldehyde, a next generation vitamin A derivative proven to be more potent than retinol yet gentler on the skin. Enriched with soothing and hydrating actives, it delivers visible rejuvenation and a smoother, brighter, more youthful