Vitamin C Skin Rejuvenator. Active Ingredient: 15% L-Ascorbic Acid. The extremely small molecule structure of this serum allows excellent penetration and absorption into your skin, this highly stable and effective formulation also allows the absorption to occur into the deep layers of skin up to forty times faster than conventional methods. L-Ascorbic Acid is considered to be one of the more effective anti-wrinkle, antioxidant, and whitening agents. It boosts collagen synthesis to firm, tone and smooth the skin and it prevents and reduces pigmentation. Our serum is especially beneficial for sun-damaged skins and helps to protect against further UVA and UVB harm.