STRAIGHTENS AND NOURISHES HAIR, FOR SMOOTH RESULTS ON ANY HAIR TYPE - Formulated to straighten, smooth, and deeply condition the hair for salon-quality results at home. It tames frizz, repairs damage, and restores shine while promoting healthier, more manageable strands. Safe and effective for all hair types including curly, wavy, thick, or chemically treated. This hair straightening treatment leaves your hair sleek, soft, and revitalised. For men and women.

⁠⁠REPAIRS HAIR TO REVEAL VISIBLY HEALTHIER, STRONGER STRANDS - The NYK1 StraightBond keratin treatment is designed to repair dry, damaged, or chemically treated hair by temporarily re aligning the protein bonds and sealing the cuticle shut. It strengthens weak strands from within, helping to reduce breakage and dullness. With continued use, hair appears shinier, smoother, and noticeably stronger - restoring its natural elasticity, softness, and resilience. Ideal for damaged or over-processed hair.

FRIZZ-FREE, GLOSSY HAIR THAT STAYS SMOOTH FOR MONTHS - Achieve long-lasting results with our deep conditioning hair treatment that eliminates frizz and adds intense shine. The advanced formula locks in moisture and creates a humidity-resistant barrier, keeping hair sleek, glossy, and manageable for up to 3-5 months. Whether you have curly, wavy, or textured hair, enjoy effortless styling and a polished look every day without heat damage or daily flat ironing.

LOCKS IN MOISTURE, REDUCING BREAKAGE AND SPLIT ENDS - NYK1 StraightBond brazilian keratin treatment seals the cuticle shut locking in moisture and reinforcing the hair’s internal structure, it helps minimise split ends and breakage from heat or styling stress. Hair feels softer, looks smoother, and becomes noticeably easier to manage over time.

AFTERCARE SHAMPOO & CONDITIONER INCLUDED FOR LONGER-LASTING RESULTS - Our complete keratin kit includes the NYK1 Salt and Sulphate Free aftercare shampoo and deep conditioning hair treatment set to preserve the longevity of your treatment and help maintain smoothness, shine, and frizz control. Regular use supports longer-lasting results while keeping hair hydrated, healthy, and easy to manage.

EFFORTLESS APPLICATION WITH CLEAR, GUIDED STEPS - Designed for easy at-home use, our complete keratin kit includes easy step-by-step instructions that guide you through the entire process. Whether you're a first-time user or experienced with a keratin treatment or split end treatment, the clear directions ensure an effortless application with professional-quality results. No salon visit required - just sleek, frizz-free hair in the comfort of your own home.

The kit straightens hair with curls, waves, volume and frizz. It also recovers hair strength, shine, hydration and softness. Expect professional result for up to 12 weeks.

This packaging includes 100ml Gold Keratin，70ml Shampoo and 70ml Conditioner, 10ml Deep cleansing shampoo.

Professional effect, lasting impact: Immerse yourself in the miracle of long-lasting hair transformation. It can penetrate deep into hair fibers, giving them strength and elasticity. To provide you with lasting professional results.

Does not contain formaldehyde. Using it at home is both simple and safe. In just a few steps, you will have smooth and silky hair that suits all hairstyles.

Karseell hair straightening kit helps to improve the hydration level of hair structure, allowing hair to straighten longer. Maintain and balance moisture to make hair soft, shiny, and frizzy.

THIS IS UK-EU VERSION FORMALDEHYDE-FREE VERSION: Advanced yet fast and simple to use keratin treatment that straightens smooths, repairs conditions and strengthens the hair using intense conditioning

Amazing results will leave hair elastic flexible & soft with a naturally vibrant shine Keratin Research's Original Formula straightens and smooths your hair for 4-6 months

Contains Argan oil coconut oils proteins and amino acid for powerful moisture binding for healthy shiny hair. On your next keratin hair treatment get Keratin Research products, nothing works as good

For very long hair and/or course and dry hair please consider the 10oz (300ml) version You want to be sure you don't run out of product in the middle of the treatment Most people finds 120ml adequate

May not be suitable for Bleached or colored blonde hair as it may alter the color a bit however there is a way to avoid it by reducing the heat (Instructions inside). Or Look for INVERTO ONE instead

PROFESSIONAL SALON TREATMENT. Our specially formulated keratin treatment penetrates and coats the hair, resulting in straighter, smoother and silkier hair that can be styled with ease.

Straightens/Smooths hair lasting 3 - 6 months.Only use salt & sulphate free shampoo & conditioner aftercare or treatment will be stripped from hair.

Kit contains everything you need to complete at home. This kit is sufficient for approximately 3 treatments of short hair, 2 treatments of medium hair or one treatment of long hair.

Green Top-up kits also available.

Our specially formulated keratin treatment penetrates and coats the hair, resulting in straighter, smoother and silkier hair that can be styled with ease.

Straightens/Smooths hair lasting 3 - 6 months. Only use salt & sulphate free shampoo & conditioner aftercare or treatment will be stripped from hair.

Salon quality and results.

Complete kits also available, with everything you need to complete treatment at home.

Salon-grade keratin, at home: Professional Brazilian Keratin smoothing and straightening treatment designed for at-home use across a range of hair types.

Complete 150ml kit: Includes 100ml Treatment + 50ml Clarifying Shampoo for a streamlined prep-and-treat routine.

Argan-oil enriched & vegan-friendly: Nourishes while smoothing to boost softness, shine, and manageability without animal-derived ingredients.

1–3 applications per kit: Usage varies by hair length and thickness—ideal for touch-ups or full treatments.

Heat-assisted results: Blow-dry to activate the formula and help reduce frizz for a smoother, easier-to-style finish.

Keratin based premium hair treatment

Long-lasting glossy finish - with the extra shine effect

Liquid 24k gold reduces static electricity in hair

Provides smooth, straight and glossy look for hair

Suitable for all hair types

Good product with good quality

Value for money

Easy to use