If you are asking "What is the best hair strengthening product?" then you will get all your answers here! Redken Extreme does a lot! Redken Extreme hair care range focuses on three things: cleansing, strengthening and restoring damaged hair. The Strength Complex containing Amino Acids and Arginine helps to make hair breakage a thing of the past. With products such as a Hair strengthening shampoo and conditioner that fortifies while conditioning (the hair breakage solution!), Fortifying rinse-out extreme mega mask for dry, damaged hair, Extreme Anti Snap 5-in-1 Protecting Leave-In Treatment and Extreme Playsafe Fortifying Leave-In Treatment with Heat Protection, Redken covers all the bases. And to top it all off, if your hair is REALLY struggling, the Redken line also features the Extreme CAT Protein Reconstructing Treatment for Highly Damaged or Processed Hair. Looking for damaged hair help? How to repair damaged hair and how to treat damaged hair are two questions Redken's Extreme, Extreme Length and Redken's Acidic Bonding Concentrate hair care collections can help with. To find the best hair care routine for your hair type and hair concerns, take the Redken Hair Quiz.