L-Ascorbic Acid is the gold standard for brightening and antioxidant protection, yet it is notoriously unstable. Our research team has spent months analyzing how light, air, and pH levels impact the efficacy of Vitamin C. Many over-the-counter serums oxidize before they even reach your skin, losing their potency and potentially causing irritation. This post explores the latest stabilization techniques, including encapsulation and the use of anhydrous (water-free) bases. We provide a scientific checklist to help you identify if your serum is still active and how to store your actives to ensure maximum biological results.