Redken Extreme Length Leave-In Treatment — Biotin & Soy Protein for Stronger, Split-End Sealing

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

This lightweight, leave-in conditioner uses Redken's Length Care Complex with biotin and soy protein to fortify weak hair from root to tip. Designed to work as part of the Extreme Length regimen, the formula smooths the cuticle, improves manageability, and adds shine without weighing hair down. It’s ideal for anyone maintaining length or repairing damage caused by styling, brushing, or environmental stressors.

How does this treatment support longer hair?

The treatment targets the structural integrity of each strand by delivering protein and fortifying ingredients that reduce breakage and visible split ends. With regular use—especially alongside the Extreme Length shampoo and conditioner—it helps hair hold onto length instead of breaking off.

• Contains biotin and soy protein to reinforce weak fiber.
• Seals and smooths split ends to limit further splitting.
• Formulated to reduce friction from brushing, lowering breakage risk.

Will it make hair feel heavy or greasy?

The leave-in is formulated to remain lightweight while delivering conditioning benefits, so it improves softness and shine without leaving residue. It’s suitable for daily or post-wash use and tames frizz while keeping hair touchable.

• Light, non-greasy texture that applies evenly through damp or dry hair.
• Absorbs to smooth the cuticle and enhance natural movement.
• Safe to layer under styling products without weighing hair down.

How should I use it for best results?

Apply a small amount to towel-dried hair focusing on mid-lengths and ends, then comb through and style as usual—no rinsing needed. For optimal reduction in breakage and split ends, use it consistently with the Extreme Length shampoo and conditioner.

• Use on damp hair after washing; concentrate on damaged ends.
• Comb through to distribute and detangle before styling.
• Use daily or whenever hair needs protection from heat and friction.

What visible benefits can I expect and how quickly?

Users typically notice smoother texture and improved manageability quickly, with reduced breakage and fewer visible split ends when used as part of the full Extreme Length system. Individual timelines vary with hair condition and usage patterns.

• Immediate: softer, shinier, easier-to-brush hair.
• Short-term: fewer tangles and less frizz with regular use.
• Long-term: decreased breakage and reduced split ends when combined with routine care.

Who this is for: Redken Extreme Length Leave-In Treatment is designed for people with fragile, thinning, chemically treated, or frequently styled hair who want to grow and maintain length. It benefits anyone looking to fortify strands, reduce breakage, and smooth split ends without heavy conditioning. For best outcomes, pair it with the rest of the Redken Extreme Length line and follow gentle handling and heat-protection practices.

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>