Every frequency in the visible and invisible light spectrum carries a certain amount of energy, and energy impacts our tissue on a cellular level. While most people associate red light with health benefits, blue and green light have also been shown to offer certain positive outcomes. According to the University of California, blue light therapy can boost alertness, helps memory and brain function, and elevates mood. It also regulates your body's natural wake and sleep cycle (circadian rhythm). In the realm of skin care, blue light is also used to treat certain types of skin cancer and precancerous spots known as actinic keratoses. You can use green light to improve the appearance of your skin by increasing collagen production and reducing inflammation. Green light can also help with treating red blood vessels on the skin’s surface.