Clinique Fresh Pressed Daily Booster with Pure Vitamin C 10% How to use: Avoid eye area. Shake before each use. For full potency, use within 7 days then discard Pack of four 34ml Clinique's super-potent booster was created to visibly rejuvenate skin to brighten and visibly reduce the signs of ageing. This unique treatment is packaged to harness the power of pure vitamin C, simply mix two drops with your moisturiser to reinvigorate your skincare routine. The special packaging isolates the pure vitamin C until activation, to maintain its freshness and full power for maximum results.