La Prairie Skin Caviar Nighttime Oil is a premium line-smoothing overnight treatment that seals in moisture and active ingredients. Infused with caviar retinol, this overnight oil gently reduces the appearance of fine lines to visibly smooth the skin. The skin's barrier system is strengthened, and the skin is deeply hydrated and plumped. This nighttime oil is housed in a unique cobalt-blue jar designed to keep the fragile caviar retinol ingredient safe from light and air.