UV radiation is part of the electromagnetic (light) spectrum that reaches the earth from the sun. It has wavelengths shorter than visible light, making it invisible to the naked eye. These wavelengths are classified as UVA, UVB, or UVC, with UVA the longest of the three at 320-400 nanometers. UVB ranges from 290 to 320 nanometers. With even shorter rays, most UVC is absorbed by the ozone layer and does not reach the earth. Both UVA and UVB, however, penetrate the atmosphere and play an important role in conditions such as premature skin aging and skin cancers.
When choosing a sunscreen, protection from UV rays should be your top consideration. Natural sunscreen delivers the best UVA and UVB protection (also known as broad-spectrum coverage).
Uses active mineral ingredients, such as Zinc Oxide and Titanium Dioxide. They reflect the sun’s rays like a mirror to protect exposed skin. Mineral active ingredients do not break down as readily in the sun as chemical ingredients.
Uses a combination of two to six of these active ingredients: oxybenzone, avobenzone, octisalate, octocrylene, homosalate, and octinoxate. They absorb rays in a chemical reaction that dissipates the heat back off the skin.