Skin's radiance is often dulled by dehydration, which manifests itself as a tired complexion, tightness and rough texture. When skin lacks water, it loses suppleness and luminosity. To restore radiance, it is essential to provide deep hydration with skincare rich in hyaluronic acid or glycerin which retain water in the epidermis. Drinking enough water, protecting the skin from external aggressions and adopting a diet rich in antioxidants also help to revitalize and illuminate the skin.