Redken Extreme Length Leave-In Treatment for Hair Growth — Biotin & Soy Protein, Lightweight Split-End Repair

Redken Extreme Length Leave-In Treatment is a lightweight, biotin-enriched leave-in that strengthens fragile hair, seals split ends and helps reduce breakage so strands can grow longer and look healthier.

Powered by Redken's Length Care Complex with biotin and soy protein, this leave-in treatment targets weak, damaged hair to improve manageability, shine and resilience between washes. It’s formulated to work as part of the Extreme Length system to protect hair from mechanical damage and make daily styling smoother, without weighing hair down.

How does this treatment reduce breakage and support longer hair?

The formula reinforces hair fibers at the root, core and tip, which helps strands resist snapping during brushing or styling. By smoothing the cuticle and providing protein-building ingredients, it reduces friction and visible damage that interrupts length retention.

• Contains biotin and soy protein to strengthen and fortify strands.
• Seals and disguises split ends to prevent further splitting.
• Reduces friction from detangling for easier, gentler brushing.
• Works best combined with Extreme Length shampoo and conditioner for maximal breakage reduction.

How do I use the Redken Extreme Length Leave-In for best results?

Apply to towel-dried hair, focusing on mid-lengths and ends, then comb through to distribute evenly. You can follow with styling as usual; no rinse needed—this treatment is designed to sit on the hair to continuously protect and condition throughout the day.

• Use after shampooing and conditioning while hair is damp.
• Dispense a small, palm-sized amount for medium-length hair; increase for thicker or longer hair.
• Work through with a wide-tooth comb or detangling brush to ensure even coverage.
• Reapply sparingly to dry ends between washes if hair feels dry or brittle.

Will this weigh my hair down or leave a residue?

Redken formulated the leave-in to be lightweight so it conditions without heavy buildup. Most users find it smooths and adds softness and shine while preserving natural movement; use sparingly near roots if you’re prone to oiliness.

• Light conditioning texture for all but very fine, oily hair at roots.
• Absorbs quickly to impart shine and manageability.
• Non-greasy finish when used as directed on lengths and ends.
• Compatible with hot tools and everyday styling routines.

What specific benefits does the Length Care Complex deliver?

The Length Care Complex blends strengthening ingredients to address fragility and visible split ends while supporting overall hair resilience. It’s engineered to work across the shaft so each section receives targeted fortification.

• Biotin supports the look and strength of strands.
• Soy protein helps rebuild and smooth the hair surface.
• Formulation reduces visible split ends and breakage when paired with the system.
• Improves manageability, making styling and detangling easier.

Who is this for: Redken Extreme Length Leave-In Treatment is suited for anyone with fragile, chemically treated or frequently styled hair that struggles to retain length. It’s a practical choice for people aiming to reduce breakage, improve shine and manageability, and protect ends between salon visits. If your hair is very fine and prone to oiliness at the roots, focus application on mid-lengths and ends to avoid weighing hair down.

Ingredients

AQUA / WATER / EAU</div><div>AMODIMETHICONE</div><div>CETEARYL ALCOHOL</div><div>TRIDECETH-5</div><div>POLYQUATERNIUM-37</div><div>PHENOXYETHANOL</div><div>PROPYLENE GLYCOL DICAPRYLATE/DICAPRATE</div><div>STEARETH-20</div><div>PARFUM / FRAGRANCE</div><div>SODIUM HYDROXIDE</div><div>CITRIC ACID</div><div>GLYCERIN</div><div>PHENYL TRIMETHICONE</div><div>CETYL HYDROXYETHYLCELLULOSE</div><div>TRIDECETH-10</div><div>PPG-1 TRIDECETH-6</div><div>CETYL ALCOHOL</div><div>PRUNUS AMYGDALUS DULCIS OIL / SWEET ALMOND OIL</div><div>BIOTIN</div><div>POLYQUATERNIUM-67</div><div>ARGININE</div><div>BEHENTRIMONIUM METHOSULFATE</div><div>CHLORHEXIDINE DIGLUCONATE</div><div>QUATERNIUM-33</div><div>SORBITAN OLEATE</div><div>ACETIC ACID</div><div>BENZYL BENZOATE</div><div>2-OLEAMIDO-1,3-OCTADECANEDIOL</div><div>HYDROLYZED SOY PROTEIN</div><div>LIMONENE</div><div>BENZYL ALCOHOL</div><div>LINALOOL</div><div>SILICA DIMETHYL SILYLATE</div><div>HYDRATED SILICA</div><div>POLYSORBATE 60</div><div>HYDROLYZED VEGETABLE PROTEIN PG-PROPYL SILANETRIOL</div><div>SODIUM ACETATE</div><div>SODIUM CHLORIDE</div><div>ISOPROPYL ALCOHOL</div><div>POTASSIUM SORBATE</div>