Extreme Length Shampoo — Reddit Reviews
by Redken
Updated November 5, 2026
Helps fine hair grow longer with less breakage; results are inconsistent.
What the community says
A salicylic-acid and biotin shampoo aimed at length retention and breakage control for fine-haired routines. Community reports less breakage and longer growth, but the SLES, fragrance, and salicylic acid can leave scalps dry or flaky.
What this means for you
What people love
- Fine-hair routine staple
- Reports of fuller hair and less breakage
Watch out for
- Can leave the scalp dry and flaky
- Protein-overload complaints include brittleness and increased breakage
Product details
Based on limited Reddit discussion so far
Where to buy
Real Reddit threads — 17 mentions across 11 threads
Redken Extreme Length Shampoo on Reddit, in one place — 11 threads from r/finehair, r/Wavyhair and 3 more, summarized.
“Some of my favs favorites are”
Positive
“Redken Extreme Length shampoo”
Positive
“I use redken extreme length shampoo and kerastase resistance conditioner.”
Positive
“Routine: Redken Extreme Length shampoo and conditioner every other day”
Positive
“I'm definitely worried about the havoc this winter will bring”
Positive
“I use redken extreme length shampoo as well as the normcore shampoo by amika.”
Positive
“I have noticed the brittle hair has been increasing the Redken.”
Cautionary
“I'm guessing the Extreme is overloading your hair with too much protein, leading to all that breakage.”
Cautionary
“I was able to start growing my hair past mid back when I switched shampoos to red ken and now it’s almost to my waist.”
Positive
“I personally have had good luck with the red Ken extreme length shampoo, drug store coconut oil conditioner and I use the red Ken all soft leave in conditioner.”
Positive