--- product_id: 590891895 title: "REDKEN Hair Treatment Mask, Biotin & Castor Seed Oil, For Longer, Stronger Hair, Extreme Length, 250 ml" brand: "redken" price: "FREE" currency: JPY in_stock: false reviews_count: 5 url: https://www.desertcart.jp/products/590891895-redken-hair-treatment-mask-biotin-and-castor-seed-oil-longer store_origin: JP region: Japan --- # 5-minute intensive treatment Biotin & Castor Oil enriched 2x stronger hair* REDKEN Hair Treatment Mask, Biotin & Castor Seed Oil, For Longer, Stronger Hair, Extreme Length, 250 ml **Brand:** redken **Price:** FREE **Availability:** ❌ Out of Stock ## Summary > πŸ’₯ Unlock your hair’s full potential with Redken Extreme Length! ## Quick Answers - **What is this?** REDKEN Hair Treatment Mask, Biotin & Castor Seed Oil, For Longer, Stronger Hair, Extreme Length, 250 ml by redken - **How much does it cost?** FREE with free shipping - **Is it available?** Currently out of stock - **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/590891895-redken-hair-treatment-mask-biotin-and-castor-seed-oil-longer) ## Best For - redken enthusiasts ## Why This Product - Trusted redken brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - β€’ **Clean & Conscious:** Not tested on animals, perfect for mindful beauty routines - β€’ **Fast-Acting Ritual:** Just 5 minutes to transform breakage-prone hair - β€’ **Power-Packed Formula:** Niacinamide, Biotin & Castor Oil nourish and protect - β€’ **Length Lover’s Dream:** Supports up to 6 inches of healthy hair growth per year - β€’ **Triple Action Strength:** Targets scalp, lengths & ends for visibly stronger hair ## Overview Redken Hair Treatment Mask with Biotin and Castor Seed Oil is a professional-grade, 5-minute rinse-out formula designed to strengthen hair up to 2x by targeting the scalp, lengths, and ends. Enriched with Niacinamide, Biotin, and Castor Oil, it nourishes the scalp, reduces split ends, and supports healthy hair growth of up to 6 inches per year. Ideal for breakage-prone, damaged hair, this 250 ml mask is cruelty-free and a must-have for anyone serious about longer, stronger hair. ## Features - Target hair at its breaking point with New Extreme Length Triple Action Treatment. Enriched with Niacinamide, Castor Oil, and Biotin, this treatment targets the scalp, length and ends for up to 2x stronger hair* *Brushing test: Extreme Length shampoo & Treatment Mask vs classical shampoo - For longer, stronger hair **On average hair can grow to 6 inch. in a year/ System vs non conditioning shampoo - After shampooing with Extreme Length Shampoo, massage into the scalp and hair for 3-5 minutes. Rinse thoroughly. ## Technical Specifications | Specification | Value | |---------------|-------| | Asin | B09MVMN2G8 | | Best Sellers Rank | 3,107 in Hair Deep Conditioners & Treatments | | Date First Available | 16 May 2022 | | Item Model Number | RDKN-P2334900 | | Manufacturer | Redken | | Product Dimensions | 5 x 7.6 x 21 cm; 260 g | ## Product Details - **Brand:** Redken - **Hair type:** Damaged - **Item form:** Liquid - **Scent:** Unscented ## Images ![REDKEN Hair Treatment Mask, Biotin & Castor Seed Oil, For Longer, Stronger Hair, Extreme Length, 250 ml - Image 1](https://m.media-amazon.com/images/I/61NDKfPcKBL.jpg) ![REDKEN Hair Treatment Mask, Biotin & Castor Seed Oil, For Longer, Stronger Hair, Extreme Length, 250 ml - Image 2](https://m.media-amazon.com/images/I/71yzRD0-l3L.jpg) ![REDKEN Hair Treatment Mask, Biotin & Castor Seed Oil, For Longer, Stronger Hair, Extreme Length, 250 ml - Image 3](https://m.media-amazon.com/images/I/81GBm5fAb+L.jpg) ![REDKEN Hair Treatment Mask, Biotin & Castor Seed Oil, For Longer, Stronger Hair, Extreme Length, 250 ml - Image 4](https://m.media-amazon.com/images/I/71wDHiUTYYL.jpg) ![REDKEN Hair Treatment Mask, Biotin & Castor Seed Oil, For Longer, Stronger Hair, Extreme Length, 250 ml - Image 5](https://m.media-amazon.com/images/I/71lqF5AKB9L.jpg) ## Questions & Answers **Q: Who is the Extreme Length System for?** A: The Extreme Length System is suitable for all hair types, but especially those who wish to focus on length retention. The formula focuses on strengthening hair to prevent breakage for longer-looking hair. **Q: What is included in the Extreme Length System Shampoo and Conditioner formula?** A: The Shampoo and Conditioner are formulated using advanced pH Science formulas, with 1% Length Care Complex including Biotin and Castor Oil. **Q: Does the Extreme Length System help with hair growth?** A: Extreme Length regimen, infused with Biotin and our Length Care Complex, promotes longer, healthy-looking, strong hair. This system reduces breakage by 92%, allowing hair to reach its maximum length. It does not help grow new hair. **Q: What is the fragrance of the Extreme Length System?** A: Top: Strawberry, Cassis, Rhubarb. Mid: Jasmine, Peony, Violet, Muguet, Blackcurrant. Bottom: Raspberry, Vanilla, Sandalwood. ## Customer Reviews ### ⭐⭐⭐⭐⭐ LOVE THIS! *by on Reviewed in the United States 13 April 2023* I've been trying to go the natural hair routine for 2 years since it seemed my hair has been struggling with length. I finally saw this product and thought "why not" since seeking to find what is best for me has been a journey for all aspects of myself.Just to let you know I only use this product once a week. I will explain: My shower routine is that I exfoliate my scalp with a salt scrub, wash with shampoo and then use the REDKEN mask and message it into my scalp for the instructed time and then rinse off with cold water. Then I used the REDKEN leave on conditioner and let my hair air dry....and I would say these two products had made my hair feel more healthy then the all natural hair routine I've been using.Yes, maybe 'all natural' works for some, but these two additions to my hair routine had relieved my hair of past issues ive been struggling with. It was always dry, and flaky the next day or within hours after a wash. I was trying to do less hair washes, but it was difficult due to how embarrassingly flaky and oily my hair got after one day. Adding the REDKEN Extreme Length Mask and leave in conditioner to my routine had allowed my hair to last a week till it showed signs of oiliness and flaking which lead me to believe I didn't have dandruff but my scalp was just overly dry from these so called 'natural' hair products. REDKEN had helped in maintaining the moisture in my hair which helped my scalp from over producing oils that ended up making it look so greasy looking and flaky. I only use it once a week and in that week my hair feels silky, soft and healthy. I feel like a model flipping my hair around its ridiculous!I have only used this product twice, as I said I've been only using it once a week. so I can't really say if it had helped my hair with growing more length. but i had done my share of research that states that when issues with hair not growing past a certain length it could be due to hair damage (or split end) causing the hair to break not allowing it to lengthen. If these products can maintain the moisture in my hair for a week, then I would confidently say that if I continue to use these products my hair strans will grow more stronger and hydrated that my ends will not be so easily broken. This is my theory after all on how this product line is intended to work. I will update this review if that is the case! ### ⭐⭐⭐⭐⭐ Awesome hair product *by on Reviewed in Canada 17 January 2026* Even though this is a bit pricey, it’s worth every penny. I have long hair and I find that when I use this product I never have knots even when my hair is wet. It is totally fantastic. ### ⭐⭐⭐⭐⭐ EXCELENTE PRODUCTO *by on Reviewed in Mexico 16 June 2026* Excelente producto. Esta mascarilla es muy buena , la uso desde hace aΓ±os . La recomiendo ## Frequently Bought Together - Redken Redken Extreme Length Triple Action Treatment Mask, Rinse-Out Mask With Biotin & Niacinamide - Redken Extreme Hair Mask For Damanged, Brittle Hair - Fortifies & Strengthens - Redken One United All-In-One Leave In Conditioner - Multi-Benefit Treatment For All Hair Types, Heat Protectant Spray, Paraben-Free --- ## Why Shop on Desertcart? - πŸ›’ **Trusted by 1.3+ Million Shoppers** β€” Serving international shoppers since 2016 - 🌍 **Shop Globally** β€” Access 737+ million products across 21 categories - πŸ’° **No Hidden Fees** β€” All customs, duties, and taxes included in the price - πŸ”„ **15-Day Free Returns** β€” Hassle-free returns (30 days for PRO members) - πŸ”’ **Secure Payments** β€” Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** β€” Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.jp/products/590891895-redken-hair-treatment-mask-biotin-and-castor-seed-oil-longer](https://www.desertcart.jp/products/590891895-redken-hair-treatment-mask-biotin-and-castor-seed-oil-longer) --- *Product available on Desertcart Japan* *Store origin: JP* *Last updated: 2026-11-14*