BTW C SCRIPTION RETAIL BOTTLE 1.0OZ. Benefits: Targets uneven skins complection, lines and wrinkles. Protects from free-radical damage. Helps boost collagen production for firmer looking skin. Texture: Fast absorbing serum. Key Ingredients: 20% THD Ascorbate: for less potential irritation and superior stability, it is proven to be more potent than L-ascorbic acid as it penetrates deeper into the skin and is more compatible with all skin types. 20% C-THD Ascorbate: a stable vitamin C to protect against free radicals.. 4% Hexylresorcinol Complex: to brighten skin tone and fades dark spots. Formulated Without: Parabens. Phthalates. Sulfates. Synthetic Fragrance.