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PPI Color Guard Shampoo, when combined with PPI Color Guard Conditioner, protects untreated, permed, or color-treated hair from fading due to damage caused by UV exposure and constant shampooing. Exposure to sunlight induces, photosynthesis-induced free radicals to weaken the structure of human hair and reduce the life of hair color, leading to dull, lifeless-looking hair. Providing nature’s best defense against color fading, Color Guard contains an herbal extract called helianthus annuus, which is made from hydroglycolic sunflower seed extract and has been scientifically proven to neutralize the oxidative radicals that fade hair color. This shampoo helps human hair retain its color longer, look more vibrant, and feel softer. 8-ounce bottle.