Redken Extreme Length Leave-In Treatment — Biotin & Soy Protein for Seals Split Ends, Reduces Breakage (125 ml)

Redken Extreme Length Leave-In Treatment is a biotin-boosted leave-in that seals split ends and fortifies damaged strands to reduce breakage and support longer-looking hair.

This lightweight leave-in uses Redken's Length Care Complex—formulated with biotin and soy protein—to strengthen fragile hair from root to tip, improve manageability, and protect strands between washes. Designed to be used alone or as part of the Extreme Length system, the treatment targets weakened areas to help hair grow longer while minimizing future breakage and visible split ends.

How does this leave-in help hair grow longer?

The formula reinforces hair structure so fragile strands are less likely to snap as they lengthen. By improving tensile strength and smoothing cuticles, hair can retain length more effectively.

• Biotin and soy protein strengthen the hair fiber for increased resilience.
• Length Care Complex supports the root, core, and tip of each strand.
• Reduces friction during brushing to limit mechanical breakage.

Will it actually reduce split ends and breakage?

When used as part of the full Extreme Length routine, clinical results show a significant reduction in breakage and split ends. The leave-in specifically seals and smooths cuticle edges to make split ends less visible and help prevent new ones.

• Reported 81% less breakage with the complete Extreme Length system.
• Reported 78% fewer visible split ends with system use.
• Targets weak, damaged areas to lower the chance of strand snapping.

How should I use the Redken Extreme Length Leave-In Treatment?

Apply to clean, towel-dried hair, focusing on mid-lengths and ends where damage is most common. The lightweight texture leaves hair manageable without weighing it down, and it can be incorporated into daily styling routines.

• Use after shampoo and conditioner on damp hair for best absorption.
• Comb through to distribute evenly and reduce tangles before styling.
• Use regularly or whenever extra protection from breakage is needed.

What results can I expect and how quickly?

Users typically notice improved smoothness and manageability after the first few applications, with cumulative strengthening and fewer visible split ends when used consistently. Maximum reduction in breakage and split ends is observed when combined with the full Extreme Length shampoo and conditioner.

• Immediate: smoother, shinier, easier-to-comb hair.
• Ongoing: stronger strands and reduced breakage with repeated use.
• Best results when paired with Extreme Length shampoo and conditioner.

Who is this for: Redken Extreme Length Leave-In Treatment is formulated for people with weakened, damaged, or fragile hair who want to protect length and reduce breakage. It suits all hair types that need strengthening and split-end management, particularly those growing out hair or seeking more resilient, longer-looking strands without heavy residues.

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>