See a visible difference in as little as 6 days when using the new visible difference optimizing skin serum together with the spainspired skincare regimen this serum uses our retinyl complex to gently retexturize skin while preparing skin to receive the benefits of your unique skin type regimen reveals healthy glowing skin tonehow it worksin a perfect world your skin would repair and replace damaged cells so quickly that youd have a continuous healthy glow in the real world our skin need