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The best hair repair treatments for stronger, shinier hair, according to over 200 women
Revive damaged hair with these bond builders, approved by our panel and experts
Tested by Maria KumarBeauty and Grooming Testing Manager
Even if we're applying the best conditioners and nourishing oils religiously to our hair, that longed-for silky softness can be all too fleeting. Locking in hydration will help keep hair healthy, but if you’re dealing with existing damage and looking for lasting strength and shine, you’ll need a product that penetrates deep within the hair shaft to re-build integral bonds.
So, if you're coveting that Claudia Winkleman gloss but seem permanently stuck with frazzled lengths, it may well be worth trying one of our best hair repair treatments, expert-tested by the Good Housekeeping Institute.
Here are our top-rated formulas at a glance, but keep scrolling for everything you need to know about these hair treatments.
The best hair repair treatments for 2026
Best bond-building treatment in lab
Wella Professionals Ultimate Repair Miracle Hair Rescue Spray 95ml
Read review
It was a decade ago when Olaplex first put bond-building hair treatments on the map — now you’ll find a structure-fortifying, damage-repairing formulation in almost every haircare range.
Each treatment uses different technologies, but the goal is always the same — stronger, shinier and altogether healthier-looking hair that’s more manageable and less prone to breakage. Some products also focus on fortifying “virgin” strands that haven't been heat or colour-damaged, making them a smart buy for everybody.
So our experts recruited a panel of testers with hair in need of TLC to help us find the best ones on the market.
How we test hair repair treatments
The Good Housekeeping Institute recruited 230 panel members to test the leading brands of bond-building treatments for up to eight weeks (based on their claims), before asking them to report back in detail on the product's ease of use, packaging, scent and, most importantly, performance. They noted any improvements in hair strength, frizz, tangles and shine over the testing period.
In the GHI beauty lab, our experts used a Dia-Stron machine to assess any improvement to damaged hair strands after each treatment.
We then pulled all the data and feedback together to award each product a score out of 100.
These are the bond-building treatments that are a cut above.
Ghd Rehab Split End Repair Sealer
Ghd Rehab Split End Repair Sealer
Score: 96/100
Heat styling can give you gorgeous, salon-worthy curls and sleekness. Unfortunately, it can also cause unwelcome split ends. Can't we just have nice things? Well, aware that its styling tools could be part of the problem, ghd has come up with a solution: The Split End Repair Sealer.
This heat-activated treatment works to seal split ends for up to 10 washes, increasing strength and reducing brittleness. And it delivered – all our testers agreed that it left their hair feeling healthier and shinier, with less visible damage. What’s the secret? It’s all in the seaweed extract, which works to smooth hair cuticles and lock in moisture.
“There was a noticeable difference to my dry, frizzy, coarse hair. It left it extremely soft and smooth,” said one tester after the trial period. We also tested two other products from the Rehab range, including the Damaged Hair Repairer (95/100), which scored best for increasing shine, and the Hair Nourisher (88/100), which was a hit for softening and moisturising.
Key specifications
| Application | Apply 1-3 pumps to towel dried hair |
|---|---|
| Treatment time | Leave-in treatment |
| Key ingredients | Red seaweed extract |
K18 Leave-in Molecular Repair Hair Mask 15ml
K18 Leave-in Molecular Repair Hair Mask 15ml
Score: 86/100
K18 won lots of fans with this leave-in formula, which left our panellists’ hair feeling stronger and looking shinier and smoother thanks to a patented bioactive peptide, claimed by the brand to be the “miracle molecule”.
Our testers were particularly impressed by how it reduced frizz and left their hair sleeker and more manageable, without adding grease. It was also found to be “extremely effective” at preventing and repairing damage by our lab team.
Key specifications
| Application | Apply to towel-dried hair after shampooing, in place of conditioner. Do not rinse. |
|---|---|
| Treatment time | Leave-in treatment |
| Key ingredients | Peptides |
Philip Kingsley Bond Builder Split End Remedy
Philip Kingsley Bond Builder Split End Remedy
Score: 85/100
Tapping into the new wave of plant-based peptides helping to reverse hair damage, this formulation uses hydrolysed oat protein to soften and hydrate lacklustre locks.
Our lab test found it strengthened strands instantly, while our panellists also noticed an immediate improvement in how healthy their hair looked. The sweet scent proved a little divisive, but all agreed this treatment ramped up softness, smoothness and shine.
Key specifications
| Application | Apply to towel dried hair |
|---|---|
| Treatment time | Leave in |
| Key ingredients | Hydrolyzed oat protein |
Wella Professionals Ultimate Repair Miracle Hair Rescue Spray 95ml
Wella Professionals Ultimate Repair Miracle Hair Rescue Spray 95ml
Score: 85/100
AHAs and omega-9s are the power duo in this formulation, which helps fight unwanted frizz and rebuild bonds inside the strands. Claiming to make hair 12 times softer, did this spray's results match its smooth-talking pitch?
Testers said hair their felt thick and healthy – like they'd had had a fresh cut – after the trial period, with some praising the “zingy” fragrance, too. This one scored full marks on our Dia-Stron machine, which measures a product's ability to stem frizz and flyaways, and most of our panel agreed their hair was more manageable after use.
The only minor complaints were about the bottle not being big enough (our panel clearly couldn’t get enough) and the lovely scent fading before testers would have liked. But we don't think they're deal-breakers.
Key specifications
| Application | Apply to towel dried hair |
|---|---|
| Treatment time | Leave in |
| Key ingredients | Alpha Hydroxy Acid, Omega-3 |
Living Proof Triple Bond Complex
Living Proof Triple Bond Complex
Score 82/100
Claiming to make hair eight times stronger against breakage than untreated lengths, this product had a lot to prove. But, it didn't disappoint. Building three types of bonds — hydrogen, ionic and covalent — with one formulation, it delivered on its promise to make bleached hair more resilient, according to our lab test.
Testers with colour-treated hair also enjoyed a boost in vibrancy and hydration after use, making it a top pick if you regularly reach for the dye.
Key specifications
| Application | Apply 2 pumps to towel dried hair |
|---|---|
| Treatment time | Wait for 10-minutes before styling. Activated by heat |
| Key ingredients | Lipids and peptides |
Aveda Botanical Repair Leave-In Treatment
Aveda Botanical Repair Leave-In Treatment
Score: 80/100
Moisturising, softening and strengthening thanks to the addition of plant-powered molecules, this treatment works to reinforce the hair’s internal structure by building thousands of new hydrogen bonds.
Our lab team found it adept at tackling damage, and our panel noticed a lasting reduction in unwanted frizz and flyaways — especially those with curly texture, who said their hair was much easier to manage. The "forest-y" fragrance was a particular hit, with testers saying the scent lingered even after styling.
Key specifications
| Application | Apply after conditioning |
|---|---|
| Treatment time | Leave in |
| Key ingredients | Plant-derived bond-building extracts |
Umberto Giannini Curl Oil Bond Repair
Score: 80/100
Designed with curls and coils in mind, Umberto Giannini products often come out top for textured hair in our tests. This time, the bond-building treatment was very effective at reducing damage and repairing bleached tresses, with testers reporting “defined and bouncy” hair that felt and looked healthier.
There were some grumbles about the bottle size among those with big, ringleted hair — although it’s affordable as a single unit, you may need to buy two to do the job.
Key specifications
| Application | Apply on damp or dry hair, scrunching it as you go |
|---|---|
| Treatment time | Leave in. Can be reapplied to drier ends |
| Key ingredients | Coconut oil, shea butter, olive oil |
Sebastian Professional No Breaker Spray
Score: 79/100
Our panel found incorporating this into their wash routine an easy habit to stick to, as the spray format and leave-in formula combined to create a convenient hair health-enhancer.
Testers were thrilled with their fuller, thicker and stronger strands. Some were a little unsure about the “clinical” fragrance, but said the smell wasn’t strong enough to put them off.
Key specifications
| Application | Apply to damp hair |
|---|---|
| Treatment time | Leave in |
| Key ingredients | Apple acid technology, vitamin B-5, styling polymers |
Score: 78/100
In 2024, pop star Rita Ora set up TYPEBEA with Anna Lahey, founder of Aussie supplement brand Vida Glow. TYPEBEA’s silicone-free haircare formulations promote hair growth and repair with the help of actives that support scalp health.
Brilliant for all hair types, but particularly those with waves or curls, the brand’s leave-in treatment instantly moisturises and hydrates. Our testers were largely won over by the mask’s ability to revive tired strands, with almost everyone agreeing their hair looked far healthier after use. It scored 3/5 in the lab for its ability to smooth straggly lengths after each use, too.
Many reported a noticeable boost in shine and softness, but a handful of testers found the texture a little on the thick side, noting that it could weigh hair down or leave behind a slightly greasy film when applied too close to the roots, so this might be one to avoid if you have ultra fine hair.
Key specifications
| Application | Apply 1-3 pumps to towel dried hair |
|---|---|
| Treatment time | Leave for 3 minutes before styling as usual |
| Key ingredients | RDS bond, wool protein and antioxidants |
Redken Acidic Bonding Concentrate Shampoo 300ml
Redken Acidic Bonding Concentrate Shampoo 300ml
Score: 77/100
Redken is a mid-range household name with a focus on protecting colour, and its “find the hue for you” AI colour matching tool has taken the internet by storm. But how does its Acidic Bonding range fare when it comes to fortifying hair against breakage?
Well, our panel was impressed with how quickly this shampoo got to work, with some noting it made hair shinier and glossier after only a few washes. Testers agreed their hair felt stronger and they experienced less breakage after regular use, but many said they would have preferred a bigger bottle.
Key specifications
| Application | Apply to wet hair before conditioner |
|---|---|
| Treatment time | Leave in for a couple of minutes before rinsing out |
| Key ingredients | Citric acid and bonding care complex |
L’Oreal Professionnel Absolut Repair Molecular Hair Oil
L’Oreal Professionnel Absolut Repair Molecular Hair Oil
Score: 70/100
Damaged hair, beware, as this slick oil is formulated to repair strands at a molecular level. It harnesses the power of peptides and amino acids, which work together to strengthen damaged strands and reduce fallout caused by weak, brittle ends. Many of our panel members agreed their hair felt more hydrated after using it.
The selling point of this one, though, is its ability to tame frizz, with lots of our panellists telling us their hair felt way more manageable after dousing their unruly mane with it.
Some said the texture was a little runny, so use with care to avoid pouring it over your bathmat.
Key specifications
| Application | 1-3 drops on wet or dry hair |
|---|---|
| Treatment time | Leave in |
| Key ingredients | Peptides and Amino acids |
Olaplex No 3 Plus Complete Repair Treatment
Olaplex No 3 Plus Complete Repair Treatment
You probably need no introduction to the wonders of Olaplex – it’s been at least a decade since the brand brought out its cult bond-protectant, which went viral in the beauty sphere way before TikTok. The No.3 Hair Protector in particular caused quite the stir, and despite its price, you’d be hard-pressed to find a bottle blonde in Britain who doesn’t love it.
It truly deserves a star on haircare's Hollywood walk of fame. Designed to be used on locks that have genuinely lost their lustre, the Olaplex Bond Maintenance system helps our editor repair and strengthen their dull and broken lengths, restoring them to their former shiny, soft glory. You remember that thick, glossy hair you had before you messed with it? Olaplex is here to bring it back.
Key specifications
| Application | Apply to wet hair |
|---|---|
| Treatment time | Leave on for 3 minutes then rinse out |
| Key ingredients | Bis-Aminopropyl Diglycol Dimaleate |
FAQs
Nicole Petty, hair expert at Milk + Blush, has noticed a dramatic rise in the popularity of hair bond builders in recent years. “Designed to chemically repair strands damaged by bleach, heat and styling, they’re a step up from regular hair masks and products that only improve the hair’s surface,” she explains.
While Olaplex uses a patented active ingredient to repair disulphide bonds inside the hair, other brands are now harnessing equally powerful molecules that penetrate further within the hair shaft to repair stressed strands, making them more resilient to damage.
Here's what you need to know.
How do hair repair treatments work?
“Bond builders repair the protein bonds that make up the keratin structure of your hair,” Petty tells us.
“They target three specific chemical bonds: disulphide (responsible for stabilising protein chains and bolstering the strength of individual hair strands); hydrogen bonds (which maintain resistance to elements such as heat and water and give your hair its texture and shape); and salt bonds (which can be prone to breakage if the hair’s pH becomes too acidic or alkaline.)
“You can repair the disulphide bonds by using a weekly bond repair treatment, or using a split end sealer to ensure already damaged ends are temporarily sealed, preventing them from splitting further up the hair shaft and reducing further breakage,” says Petty.
“The main benefit of bond-building products is that they repair broken links in the hair’s cortex, providing increased strength and resilience to damage – from heat styling and colouring – which can help to reduce split ends, breakage, dryness, tangles and frizz.”
Who needs hair repair treatments?
“Bond-building treatments were previously only available in professional salons at an additional cost,” explains Petty. “However, with the ongoing cost of living crisis reducing disposable income, salon visits and professional treatments have become less popular in lieu of more affordable home treatment alternatives.
“You can use these products on any hair type, but they’re targeted at repairing damaged hair,” she adds. “When it comes to thicker hair, usually you would need to use more of the product than is suggested to ensure the ends are fully covered and it can work most effectively,” she adds.
The verdict on hair repair treatments
Our winner, Ghd's Split End Repair Sealer was awarded top marks by our testers for taking their hair from frizz to fab. The split end sealer effectively reduces breakage and left locks looking strong and feeling healthy.
Philip Kinglsey’s Bond Builder was praised by our panellists for immediately boosting hair health. But don’t just take their word for it, as the results from our lab test showed it strengthened strands immediately after treatment time, too.
If you have curly hair and want to keep those coils bouncy and defined, then Umberto Giannini’s Curl Oil is the perfect solution. At under £7, it’s also our most affordable treatment on the list.
Maria is our Beauty and Grooming Testing Manager, and since joining in mid-2022, she has managed the testing for mutiple categories including scalp scrubs, collagen supplements and retinol serums. In addition to her master's degree in chemical engineering and a diploma in cosmetic science, she recently received her MBA from the London College of Fashion, focusing on case studies within the beauty industry. Prior to joining the company, she worked within the global technical team at the Estee Lauder Companies for over six years, collaborating with the chemists and engineers to launch luxury beauty products at scale and to quality. She has also worked as a formulation scientist within the pharmaceutical industry and takes this evidence based approach into all her product testing.
