See 3 member reviews and photos. Redken Extreme Length Sealer: rated 4 out of 5 on MakeupAlley. I was keen to try this range as I’ve had great … Read honest and unbiased product reviews from our … I have really enjoyed using this entire line of Redken … Redken's Extreme Length system with Biotin helps hair grow stronger, allowing you achieve up to 6" of … The Redken Extreme Length Shampoo is a great quality product. I apply this to the damaged ends of my hair after washing and towel drying, and while it is not a miracle worker, it really does help seal my split ends so my looks and feels much less damaged. I’m very fussy about which brands I trust to use on my hair and Redken is one of the few on my list. Redken Extreme Length Sealer Split-End Treatment has made a huge difference in my hair! Extreme Length With Biotin - Get longer hair Does your hair have damage and trouble growing longer? Find helpful customer reviews and review ratings for Redken Extreme Length Primer Rinse-Off Treatment, 5 Ounce at Amazon.com.