Garnier Light Complete booster Serum The new Garnier Light Complete Vitamin C Booster Serum, our lightening formula enriched with 30X* Vitamin C and fresh Yuzu Lemon extract from Japan. This light and fast -absorbing texture acts deeply at various stages of the melanin darkening process. The result: with PROVEN ACTIVE helps reduce darkening of melanin by 85%** in just 6 days. The skin looks bright and smooth and disguises blackheads. Directions Day & night, apply evenly on perfectly clean face and neck before you apply your daily moisturizer.