Rehydrating Facial Serum refreshes and rejuvenates skin throughout the day, while stimulating you skin's own defenses against the negative impact of UV and blue light damage. Made with butterfly plants grown in the Swiss Alps, which help treat against environmental pollutants. What is blue light? Blue light is high energy visible light that emits from screens like from your phone and computer screens. Long-term blue light exposure to concentrated sources of blue light energy can cause skin damage, including color changes, inflammation, and weakening of the skin's surface. Simply put, blue light promotes stressors in skin that cause photo-aging; that is, aging from exposure to light.