Each 7-day supply assures you of fresh-pressed power. The dual-chambered design keeps the Vitamin C fresh, you mix it. To activate, leave cap on and remove foil. Firmly press inner bulb twice. Shake 15 seconds.Use 2 drops, AM and PM, with your Clinique moisturizer. Avoid eye area. Shake before each use. For full potency, use within 7 days then discard. No parabens. No phthalates. No fragrance. Just happy skin.