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Ultraviolet: See UV.

Umbel: The umbel is the flat-topped mass of flowers on stalks, where the stalks are of equal size.

Una de Gato: (Cats Claw) The highly effective properties contained in the inner bark of the cat's claw plant have demonstrated to profoundly and positively influence the body's defense system. It is alos known to help ones circulatory and gastrointestinal systems through its antioxidant and build properties.

Undertone: In cosmetics, undertone refers to cool or warm tones of the skin. Your undertone is determined by the color of your eyes, your natural hair color, and which colors make you look pretty. Most foundations are based around the undertone of the skin.

Unipertan: A suntan-accelerating product composed of tyrosine, riboflavin, and collagen. The original form of unipertan employs animal by-products.

Unipertan V-242: A totally vegetable form of unipertan, providing tyrosine (an amino acid essential to the tanning process) and adenosine triphosphate (a vegetable catalyst to the tanning process), in a vegetable collagen base.

Unitrienol T-272: A patented blend of fernesyl acetate, farnesol, and panthenyl triacetate that helps in the regulation of moisture and oil levels in the skin while promoting elasticity. It is generally an ingredient found in skin and lip products. Bioactive complex with cell regenerating properties to: smooth wrinkles, improve skin elasticity, and regulate the levels of skin moisture and sebaceous matter. Studies show that unitrienol reduces the appearance of wrinkle depth.

Urea: Chief waste products of the body. The kidneys flush the waste from the body in the form of urea, which is in the urine.

Uric Acid: The final end product of certain native or dietary proteins, especially the nucleoproteins found in the nucleus of cells.  

Urinary Tract: The kidneys and the lower urinary tract, which includes the ureters, bladder, and urethra.

Urticaria: A skin condition commonly known as hives. Raised white lumps surrounding a red area of inflammation.

UV: Ultraviolet radiation. The invisible spectrum of solar radiation. It is divided into three regions with increasing danger to the skin; UV-A, UV-B, and UV-C.

UVA: Ultraviolet light, type A - rays of light from the sun that are not visible but can cause damage to the skin. Approximate wavelength: 320 to 400 nanometers. UVA rays penetrate deeply into the skin. . “The sun aging rays.”

Uva-ursi: See Bearberry.

UVB: Ultraviolet light, type B - rays of light from the sun that are not visible but can cause damage to the skin. Approximate wavelength: 285 to 320 nanometers. They cause cellular damage to outer layers of the skin. It's drying and it's aging. “The Sun burning rays.”