LA'BANGERRY keratin shampoo for color-treated hair is sure to be very gentle on your hair and will make it silky, soft, and smooth, giving it a luscious look without causing any irritation or allergic reactions. Keratin shampoo Can Make Hair Stronger. Salon keratin treatments—which smooth the hair and help repair the hair shaft—have gotten a bad rap due to their harsh formulas. However, keratin shampoos have emerged as a gentler and easier way to incorporate the ingredient into your hair care routine. *Here are some of the benefits of using keratin shampoo: 1. Cleanses hair without stripping away its natural oils, 2. Strengthens the hair shaft, 3. Makes hair smoother and more manageable, 4. Reduces frizz and flyaways, 5. Helps to protect hair from heat styling and damage.