Geek & Gorgeous C-Glow is a serum with 15% Vitamin C (15% ascorbic acid) that reduces pigmentation spots and provides an even skin tone with an instant glow. It also protects the skin from harmful environmental influences and stimulates collagen production. The super-light, water-based formula absorbs quickly into the skin without leaving a sticky feeling. The included antioxidants (ferulic acid and vitamin E) protect the skin from harmful environmental irritants, free radicals, and oxidative stress. In combination with the low pH value of 3.2-3.4, they stabilize the Vitamin C in the serum, making it last longer. When stored in the refrigerator, the serum remains effective for at least 3 months after opening. Unopened, it lasts up to 6 months. At room temperature, the serum has a shelf life of about 6 weeks after opening. C-Glow is suitable for all skin types. However, due to its high acid content, it may cause irritation in sensitive skin prone to redness.