Dr. Brandt Drop Of Strength All-Day Strengthening Serum is your first line of defense against everyday damage. This ultra-light fortifying serum helps defend your skin from oxidative stressors and is highly regarded for its rapid absorption into the skin, allowing you to apply it even before your favorite serum! A pre-serum is a game-changer for skin resilience. In fact, healthy and resilient skin is better prepared and more adept at embracing the subsequent steps, resulting in the ultimate skincare experience. By saturating your skin with Immubarrier Complex, a blend of alpha-glucan from yeast extract, Hyaluronic Acid 2.0 and artic berry extract, this serum elevates the effectiveness of the rest of your routine.