Peter Thomas Roth Power C 20 Anti Oxidant Serum Gel.Maximum strentgh formulation of 20% vitamin C. Helps increase collagen production for smooth radiant skin. Helps reduce the appearance of fine lines, wrinkles. Helps facial contours look and feel smoother, firmer and more youthful. Helps protect against future free radical damage. Also loaded with anti-oxidants and recommended for all skin types.