Uvb – Rays that cause the skin to tan and burn.
Uvc Rays- A type of ultraviolet radiation. UVC rays are even shorter wavelength UV rays however they do not make it through the earths atmosphere.
Urea- Component of urine, although synthetic versions are used in cosmetics. In small amounts urea has shown to rejuvenate the skin.
Uva- Ultraviolet rays from the sun that cause premature ageing to the skin.
Universal Precautions- The policy of the Centers for Disease Control (CDC) for safety in the presence of blood and other body fluids, which are potentially infectious sources of human immunodeficiency virus (HIV), hepatitis B and C viruses, and other bloodborne pathogens.
Ultramarines- Inorganic pigments (of various colors) permanently listed by the FDA for external use only.
Ultraviolet A (Uva) Rays- Sometimes referred to as the aging rays, these rays from the sun penetrate deeper into the skin than ultraviolet B rays and cause photosensitivity reactions.
Ultraviolet B (Uvb) Rays- Sometimes referred to as the burning rays, these rays from the sun are the primary rays associated with skin damage and skin cancer from sun exposure.
Ulva Lactuca Extract- Extract from the plant known as sea lettuce, it has some soothing and antioxidant properties.