medicube Deep Vita A Retinol Serum 30mlCombat visible signs of aging with this powerful serum anchored in seven layers of retinol to boost skins collagen levels while brightening and hydrating skin. The formula is infused with niacinamide to brighten dark spots, squalane to repair skin damage and panthenol to keep skin resilient. For optimal results, introduce the serum gradually into your nighttime skin care routine, taking care to apply no more than a pea sized amount every time.