Collistar Attivi Puri Retinol + Panthenol facial serum is designed to renew, brighten and even out the complexion. The effectiveness of these drops lies primarily in hydroxypinacolone retinoate (HPR), a retinol derivative. HPR accelerates the cell renewal process, which is a key factor in achieving smoother, more youthful-looking skin. It also increases collagen synthesis. Overall, it reduces fine lines and wrinkles, evens out skin tone and improves skin texture, making it an excellent ingredient in anti-ageing skincare. Equally important, HPR stands out for its high tolerance, even on sensitive skin, delivering all the proven benefits of traditional retinol without unnecessary irritation. Panthenol complements the action of HPR with its soothing properties. This ingredient effectively reduces redness while helping to repair and strengthen the skin barrier.