The skin is exposed daily to external influences that can affect its appearance. These include UV radiation, environmental pollution, and stress, which are associated with the formation of free radicals. Protection against oxidative stress is an important part of daily skincare. The TetraVIT C 10% Glow On serum has a non-comedogenic formula with a light texture. It absorbs quickly without feeling heavy on the skin and leaves no greasy residue. The skin appears nourished, fresh, and naturally radiant. Results from application studies* 100% of users reported that the TetraVIT C 10% serum improved the appearance of the skin. 100% of users confirmed that the product supports the skins natural radiance. 80% of users noticed that their skin tone appeared more even. 100% of users confirmed that their skin appeared fresher and more hydrated. 93% of users rated the product as well suited for use under makeup. 97% of users reported that their skin felt firmer. *Application study over 4 weeks, conducted in an independent testing laboratory (n=30 self-assessment, n=10 instrumental measurements). Measurable results* Instrumental measurements showed an increase in skin hydration of up to 15% with regular use of the antioxidant serum TetraVIT C 10%. TetraVIT C is a stable form of vitamin C. It helps protect the skin from oxidative stress and supports a healthy complexion.