Beauty
Redken Extreme Length Shampoo
Biotin + Length Care Complex. Clinically formulated to reduce breakage and help you keep length.
What Is the Redken Extreme Length Shampoo?
Redken Extreme Length is a strengthening shampoo built around biotin as its key active ingredient. Biotin is a B-vitamin that plays a direct role in keratin production — the structural protein your hair is made of. Redken pairs it with their proprietary Length Care Complex, a blend of conditioning agents designed to reinforce the hair's outer cuticle layer and reduce mechanical damage during washing and styling.
The shampoo is designed specifically for people who struggle to retain length because of breakage — not because their hair grows slowly, but because it snaps off before it gets long. This is a meaningful distinction the brand makes clearly, and it is consistent with what the formula is actually built to do.
It is color-safe, lightweight, and gentle enough for daily use on all hair types. It comes in three sizes and is part of the Extreme Length three-product system. The headline claim of 81% less breakage applies to the full system — shampoo, conditioner, and leave-in treatment used together — not the shampoo alone.
Redken is a professional salon brand that has been part of the L'Oréal portfolio since 1993.
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Honest Pros & Cons
Noticeably reduces breakage and shedding
Lightweight formula — does not weigh hair down
Rich lather that rinses clean
Gentle enough for daily use and color-treated hair
Mild, non-overpowering scent
Works on all hair types including fine hair
The 81% breakage reduction requires the full system — shampoo alone will not get you there
Takes several weeks of consistent use before visible results
Higher price point than drugstore alternatives
Some users with very dry hair find it slightly drying without the conditioner
In-Depth Review
TL;DR - Too Long, Didn't Read
If your hair breaks before it can grow, the Redken Extreme Length Shampoo is worth trying.
It is a salon-quality, biotin-infused strengthening shampoo designed specifically for people who struggle to retain length because of damage, heat styling, or chemical processing.
The formula is lightweight, lathers well, and is gentle enough for daily use on all hair types including fine hair. That said, the headline claim — 81% less breakage — applies to the full three-product Extreme Length system, not to the shampoo alone.
Used by itself, you can expect noticeably cleaner, stronger-feeling hair and reduced breakage over several weeks, but you will get the best results pairing it with the Extreme Length Conditioner and Leave-In Treatment.
Key Ingredients: What Biotin Actually Does in a Shampoo
Biotin shows up on a lot of labels these days, and there is a fair amount of skepticism about whether it does anything when it is in a rinse-out product. Here is the honest version: biotin in shampoo works primarily at the hair surface level, not by penetrating the scalp the way an oral supplement might.
What it does well is help coat and condition the hair shaft, which reduces brittleness and makes strands more resistant to snapping during combing and styling. Redken pairs biotin with their proprietary Length Care Complex — a blend of conditioning agents designed to reinforce the hair's outer cuticle layer and reduce mechanical damage.
The result is not hair that magically grows faster, but hair that retains more of the length it is already growing because breakage is reduced. For people dealing with damage from bleaching, heat tools, or chronic breakage at the ends, this distinction matters. The product is not a growth serum — it is a breakage reducer, and it does that job well.
How to Use It
Step-by-step application:
Wet hair thoroughly before applying
Apply a coin-sized amount to the scalp
Massage in circular motions to build lather, then work through mid-lengths and ends
Rinse thoroughly — incomplete rinsing is a common reason the shampoo feels heavy
Follow with Extreme Length Conditioner, especially if your hair is dry or very porous
For the full 81% breakage reduction result, use all three: shampoo, conditioner, and Leave-In Treatment
How much to use: More lather does not mean more effectiveness. A coin-sized amount for short to medium hair and a slightly larger amount for long, thick hair is enough. The shampoo lathers quickly, so first-time users often use more than they need.
Frequency: The formula is gentle enough for daily use, including on color-treated hair. If you only have dry or slightly damaged ends, every other day works just as well and extends the bottle significantly.
What It Feels Like: Lather, Scent, and Texture
The first thing most people notice is the lather. It builds quickly with a small amount of product, which is a practical advantage for a higher-priced shampoo — a little goes a long way. The scent is mild and clean, described by multiple verified buyers as not overpowering, which makes it easy to pair with other scented leave-in products without fragrance conflicts.
After rinsing, hair feels clean without the stripped, squeaky feeling that some strengthening shampoos leave behind. That quality matters especially for people who wash frequently.
One thing worth knowing: if your hair is very dry or highly porous from heavy bleaching, the shampoo can feel slightly drying when used alone. This is where pairing it with the Extreme Length Conditioner changes the experience significantly — the conditioner is where the moisture balance is restored.
Does It Actually Work?
The 81% less breakage claim is Redken's own clinical data measured using the full Extreme Length system — shampoo, conditioner, and leave-in — not the shampoo independently. This is important context the packaging does not make obvious, and it is the main source of disappointment in negative reviews. Buyers who purchase only the shampoo and expect dramatic transformation in a few weeks are setting themselves up for frustration.
The reviewers who report genuinely visible results are almost always those who used the product consistently for several months, often with the full system.
One verified Amazon buyer with fine, heat-damaged, and color-treated hair noted her hair was getting longer and looked healthier after extended use — exactly the hair type this product targets. At nearly 10,000 reviews on Amazon Canada with a 4.5-star average, the broader pattern is clear: it works, but it requires patience and ideally the complete routine.
What Real Users Say
With 4.5 stars across nearly 10,000 reviews on Amazon Canada, the Redken Extreme Length Shampoo has a strong track record with real buyers.
The most consistent praise is for its breakage reduction — one verified buyer in her 50s with straight hair said her hair became "so healthy and barely any split ends" after starting the shampoo. Another reported seeing less breakage after brushing within weeks of switching. The lather and scent also come up repeatedly in positive reviews: buyers describe it as sudsy, clean, and gentle with a fragrance that is pleasant but not overwhelming.
The critical reviews tend to come from buyers who expected visible hair growth from the shampoo alone in a short time frame — a common misconception that the product's marketing partly encourages. A smaller number of users with very dry hair found it drying without the paired conditioner.
The overall pattern across thousands of reviews is clear: consistent users who manage their expectations and use it as part of a complete routine see real, lasting improvements in hair strength and length retention.
Ready to try the Redken Extreme Length Shampoo?
Is it worth it?
For the right type of hair concern, yes. The Redken Extreme Length Shampoo occupies a solid position between mass-market strengthening shampoos and high-end bond repair systems like Olaplex. It is more effective than most mass-market options and more accessible in price than premium repair treatments, making it a practical choice for people who want a step up without committing to a full luxury haircare budget. The key condition is managing your expectations correctly. This is a breakage-reduction shampoo, not a hair growth accelerator.
Hair grows at roughly half an inch per month regardless of what you put on it — what this product helps with is making sure that growth is retained rather than lost to breakage at the ends. If that is your problem, the high price point is justified. If you are looking for something to speed up growth from the root, no shampoo will do that.
In Canada, the value case is reasonably strong. At a high price point for the entry size, it is more expensive per wash than mass-market options but on par with other professional salon brands. Used correctly — and ideally with the full system — most consistent users find it delivers on its core promise.
Who It's Best For
Fine hair: The lightweight formula works in fine hair's favor. Multiple verified buyers with fine, thin hair report it does not weigh the hair down or leave residue, which is the typical dealbreaker with strengthening shampoos. One buyer mentioned using it long-term on fine hair that breaks from heat styling and coloring — and seeing improvement. A coin-sized amount is enough for fine hair; no more.
Color-treated hair: The formula is gentle enough to preserve color while cleansing effectively. Redken specifically notes it helps maintain hair health through coloring and bleaching processes. For anyone who bleaches their hair and deals with chronic breakage, this shampoo paired with the conditioner is one of the more targeted options available at this price point without going into the Olaplex range.
Best for:
People with color-treated, bleached, or heat-damaged hair who struggle to retain length due to breakage
Fine hair types looking for a strengthening shampoo that will not weigh hair down
Anyone who has tried mass-market strengthening shampoos and found them too heavy or ineffective
People committing to a full routine and willing to pair it with the conditioner and leave-in for full results
Not ideal for:
Anyone expecting faster hair growth — no shampoo changes the rate hair grows from the root
Very dry or highly porous hair used without the paired conditioner
Budget-focused buyers — there are effective lower-cost alternatives if price is the main concern
Quick Specs
Brand: Redken
Line: Extreme Length
Key Ingredient: Biotin + Length Care Complex
Hair Type: All types
Primary Benefit: Reduces breakage, strengthens damaged hair
Color-Safe: Yes
Scent: Mild, clean floral
Fragrance-Free: No
Sizes Available: 10.1 fl oz / 16.9 fl oz / 33.8 fl oz
Price Range: High
Best Used With: Extreme Length Conditioner + Leave-In Treatment
