Brighten, hydrate, and smooth skin with this high-strength vitamin C serum. Clinical Formulations with Integrity. 30mlA Water-Free, Silicone-Free Stable Suspension water-free alcohol-free oil-free silicone-free nut-free vegan cruelty-free Vitamin C is an effective antioxidant and its pure form of L-Ascorbic Acid has been shown to reverse multiple signs of skin ageing while brightening the skin when applied topically. This water-free, silicone-free formula provides 23% pure L-Ascorbic Acid which remains completely stable due to the absence of water. The system is supported with addition of dehydrated spheres of Hyaluronic Acid to offer visible surface smoothing alongside the benefits of Vitamin C. This treatment is ideally applied at bedtime. Note: Based on recommendation from our customers, this formula is now offered in a tube format for easier dispensing. This product is a water-free suspension of 23% L-Ascorbic Acid powder. The Ordinary's portfolio of Vitamin C includes the following formulations Directions Apply a small amount to face in the AM or the PM. A slight tingling sensation can be expected after application.