What it is: A serum with 20% THD ascorbate—a mega-potent, ultra-stable ingredient 50 times more powerful than traditional vitamin C—that visibly brightens skin.Skin Type: Normal, Dry, Combination, and Oily Skincare Concerns: Dark Spots, Dullness, and Uneven Texture Formulation: Lightweight Serum Highlighted Ingredients:- THD Ascorbate 20%: Ultra-stable scientific breakthrough form of vitamin C that is 50 times more powerful than traditional vitamin C.- Vitamin E 3% and Ferulic Acid 2%: Help boost the performance of THD ascorbate vitamin C while providing antioxidant benefits. Ingredient Callouts: Free of sulfates SLS and SLES, parabens, formaldehydes, formaldehyde-releasing agents, phthalates, mineral oil, retinyl palmitate, oxybenzone, coal tar, hydroquinone, triclosan, and triclocarban, and contains less than one percent of synthetic fragrances. This product is also gluten-free.What Else You Need to Know: Packed with a jaw-dropping concentration of 20 percent THD ascorbate vitamin C, this serum’s performance is boosted by two ultra-powerful antioxidants to help hydrate and improve the look of fine lines, wrinkles, firmness, uneven skin tone, texture, and brightness.