Supercharge your glow with a high-performance vitamin C. This powerful daily antioxidant serum is made with 15% pure L-ascorbic, the industry's gold standard of vitamin C to help defend all day from free radicals and works to brighten skin tone and reduce signs of past skin damage. Key Ingredients: Known as the purest form of Vitamin C, L-ascorbic Acid helps neutralize free radicals, minimize the look of fine lines and wrinkles, and brighten skin tone. Dermstore has partnered with Flex to allow you to use your Health Savings Account (HSA) or Flexible Spending Account (FSA). This means you can now use your HSA or FSA debit card to buy Obagi Medical products with pre-tax dollars, resulting in net savings of 30-40%, depending on your tax bracket. Eligible for HSA/FSA with a letter of medical necessity at checkout. From dermatologist-recommended treatments to solutions for chronic skin conditions like acne, eczema, and rosacea, these products are both effective and eligible. | Obagi Medical Professional-C Serum 15%, 0. 42 oz | Dermstore