1. Why Vitamin C? Vitamin C (above 10% concentration) when applied on skin is proven to act on hyperpigmentation dark spots oxidative damage like wrinkles and provide a to the natural glow of your skin. 2. Why Plum Mandarin + 15% Vitamin C Serum?- Thoughtfully formulated for targeted efficacy safety and all-round results- Contains Ethyl Ascorbic Acid (EAA 15% active) a water-soluble form of Vitamin C that penetrates skin quickly and stays stable for longer without oxidizing- When we say 15% we mean 15% - because weve ed 17.5% of EAA which contains 86% active Vitamin C by Real people real results. Myplum previews consumer panel reported:â 83% users saw enhanced skin glow in just 2 weeksâ 32% reduction in dark spots in just 2 weeksSelf assessment study conducted on 41 subjects with varying skin types