Best Bond Repair Treatment: Olaplex vs K18 and Six More
Olaplex, K18 or the drugstore one? For most people, Olaplex No.3PLUS; for freshly bleached hair, K18; on a budget, L'Oréal Paris EverPure Bond Repair+. Below, which bond (the links that hold hair together on the inside) each of the eight treatments we compared says it repairs, and what sits behind each claim.
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Our recommendation
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Our pick
Olaplex No.3PLUS Complete Repair TreatmentIts bond ingredient is one of the few studied outside the brand, though the two independent studies we found do not agree on whether it rebuilds from the inside. And it fits most routines if you have three minutes before shampoo: every 1 to 3 washes, mid-priced and protein-free.
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If you want to spend little
L'Oréal Paris EverPure Bond Repair+ Pre-ShampooIt is the drugstore-priced one and the step that completes its own range: if you already use its shampoo and conditioner, this is the one missing. The figures the brand gives were measured with it as part of a routine, not with the pre-shampoo alone. It sells as Elvive in Spain, EverPure in the US and Elseve in Brazil.
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For freshly bleached hair
K18 Leave-In Molecular Repair Hair MaskIt is one of the two that say which bond they repair, and its test was run on bleached swatches with the product alone, though it does not say what it compared against. Its brand recommends it for the first 4 to 6 washes after a salon service.
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If you are in a hurry in the shower
Joico Defy Damage In A Flash 7-Second Bond BuilderIt is the fastest of the eight: a seven-second rinse-off. The brand does not publish its ingredients and asks you to keep it off the scalp. In return, its figure says how and against what it was measured: up to 20 times more resistance to combing breakage, on damaged hair and against untreated hair.
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Skip it if you will not use its whole line
Redken Acidic Bonding Concentrate Leave-In TreatmentIts most striking figure, a year of damage in one use, was measured with four products from the same line and against undamaged hair. If you already use that line, it is the leave-in step that completes it, which is how it was measured.
We read all 8 official pages verified on we have not tested them, and the commission does not decide what appears here How we do it
This is us: we make Blendsor, the colour formula app for salons. We spend our days reading hair colour technical sheets, so reading labels is the job.
Before you buy
Of the eight, only two say which bond they repair. K18 names the protein chains and the sulfur bridges; Living Proof tells three types apart and warns that one is only repaired with heat. The other six say "bonds" without saying which. Three of them, all from L'Oréal, rest their claim on citric acid, and a study signed by L'Oréal's own researchers puts that acid's effect down, probably, to a mix of mechanisms, among them removing calcium, pH and strengthening the weaker, non-covalent links. Practical advice: if the label does not say which bond, read its claim as "stronger hair", which is no small thing.
What is your case?
The seal says what each brand publishes about color duration. It does not measure whether the product works: a bottle with no figure can be excellent at its own job.
- Figure with no method explained
Olaplex
Olaplex No.3PLUS Complete Repair Treatment
A short, protein-free pre-shampoo, with a strength figure that says after how many uses, but not against what or what test it ran.
3x stronger
- Right for
- Bleached or breaking hair, and anyone wanting a protein-free treatment before shampoo.
- Not for
- Anyone hoping it replaces conditioner: it is rinsed out after three minutes, and shampoo and conditioner come after.
- Olaplex presents it as the replacement for No.3 Hair Perfector, which its site no longer sells
- Its bond ingredient, Bis-Aminopropyl Diglycol Dimaleate, sits fourth in a list of 56
- Three minutes, rinsed out, and its brand recommends using it every 1 to 3 washes
- Its Spanish-language page says "no colorants" and its ingredient list carries two
- Leave-in time: 3 min
- Price on the brand’s site: 34 € / 100 ml, España
- Salon price
- Figure with no method explained
K18
K18 Leave-In Molecular Repair Hair Mask
One of the two that say which bond they repair, explaining what hair it measured on, without saying against what.
2x more resistant to breakage
- Right for
- The first washes after bleaching or coloring at the salon, which is what its brand recommends it for.
- Not for
- Anyone wanting to apply it after their usual conditioner: its page asks for shampoo with no conditioner first, and allows conditioner after the four minutes.
- Its test was run on bleached swatches, after a single four-minute application, with the product alone, and that is what it calls clinically proven
- Its figure is not on the product page: it is on its legal disclaimers page
- Its own ingredient is a peptide, ninth on the list, and it also carries hydrolyzed wheat protein
- It is not rinsed out, and its page asks you not to use conditioner before it
- Leave-in time: 4 min
- Price on the brand’s site: 75 € / 50 ml, España
- Salon price
- Figure with no method explained
L'Oréal Paris
L'Oréal Paris EverPure Bond Repair+ Pre-Shampoo
The drugstore one, with almost the same ingredient list and a different claim in each country.
Different figures in Spain and the US
Measured with the full routine, not with this bottle alone
- Right for
- Anyone wanting to spend little and use the whole range: its tests were run with the routine.
- Not for
- Anyone after the figure for the bottle alone: the ones it explains come from using it with shampoo and conditioner.
- In the US it is sold as EverPure Bond Repair+ and in Brazil as Elseve Bond Repair, with citric acid sixth on the list in all three
- Its Spain page promises 82% more rebuilt bonds with no note explaining it; the US page, 3x stronger hair with its shampoo and conditioner, though another note with the same asterisk talks about four steps
- Each country gives a different percentage: 12% repair complex in Spain, 18% citric acid in Brazil, none in the US
- Its range in Spain compares itself with an Olaplex routine that includes No.3 Hair Perfector, which Olaplex has since replaced
- Leave-in time: 5 min
- Price on the brand’s site: 12,99 $ / 5.1 fl oz, EE. UU.
- Drugstore price
- Figure with no method explained
Kérastase
Kérastase Première Concentré Décalcifiant Repairing Pre-Shampoo
Its Spain page separates which figures are for the bottle alone, but neither of its two pages says both how it measured and against what.
93% less breakage
- Right for
- Breaking hair washed in very hard water, and anyone using its line.
- Not for
- Anyone wanting a standalone step: it goes on before shampoo and, without rinsing it, its line shampoo goes on top.
- Its Spain page separates the figures, two for the product alone and the 99% one from using it six times with its shampoo and conditioner or mask, though one paragraph tags the 99% with the other note
- On its US page the same asterisk points to two different notes
- Its stated active is glycine with citric acid, and its Spain page talks about 8% acids
- Five minutes on damp hair before shampoo
- Leave-in time: 5 min
- Price on the brand’s site: 67,50 € / 250 ml, España
- Salon price
- Figure with a declared method
Living Proof
Living Proof Triple Bond Complex
The only one telling three types of bond apart, and the one asking for the longest wait before drying.
8x stronger · Breakage from combing or brushing, against untreated hair.
- Right for
- Breaking hair, once a week, for anyone who blow-dries afterwards.
- Not for
- Anyone who air dries: its page warns that part of the repair only switches on with heat.
- It names three types of bond, and says the one it calls covalent is only repaired with heat
- Its figure measures combing breakage against untreated hair, without saying on what hair or how many samples
- It asks you to wait ten minutes before drying or applying anything else, and to use it once a week
- It compares itself with "the leading bond builder" without saying which
- Leave-in time: 10 min wait
- Price on the brand’s site: 45 $ / 1.5 fl oz, EE. UU.
- Silicone-free
- Salon price
- Figure with no method explained
Redken
Redken Acidic Bonding Concentrate Leave-In Treatment
Its one-year figure was measured with four products from the line and against undamaged hair.
1 year of damage in 1 use
Measured with the full routine, not with this bottle alone
- Right for
- Anyone already using the Acidic Bonding Concentrate line who wants a step that is not rinsed out.
- Not for
- Anyone with fine hair that feels weighed down by silicones: in this one, the second ingredient on the list is a silicone.
- The one-year figure comes from using its intensive treatment, shampoo, conditioner and this product together
- On its list a silicone comes second and citric acid fourteenth
- Its US page says it combats visible damage; the Spain page, that it repairs it
- It goes on clean, damp hair, is not rinsed out, and its Spain page recommends daily use
- Price on the brand’s site: 39 $ / 150 ml, EE. UU.
- With silicone
- Salon price
- Figure with no method explained
L'Oréal Professionnel
L'Oréal Professionnel Absolut Repair Molecular Rinse-Off Serum
It says what type of test it ran, but not against what, and its headline figure is for three products.
2 years of damage in 1 use
Measured with the full routine, not with this bottle alone
- Right for
- Anyone short of time in the shower who already uses its line shampoo.
- Not for
- Anyone not planning to use its shampoo and mask: the figure on its label comes from using all three.
- Its two-year figure comes from an instrumental test with its shampoo, this serum and its mask
- The five amino acids do appear on its list; the bond repairer cannot be identified in it
- Its Spain page says it repairs two years of damage; the US page, that it visibly fights it
- It is worked through with the fingers for one or two minutes, after shampoo and before conditioner
- Leave-in time: 1 to 2 min
- Salon price
- Figure with a declared method
Joico
Joico Defy Damage In A Flash 7-Second Bond Builder
The fastest of the eight, and one of the two that say in the same note what they measured and against what.
Up to 20x more resistant to breakage · Combing breakage on damaged hair, against untreated hair.
- Right for
- Anyone wanting a seconds-long step in the shower on days their hair feels weak.
- Not for
- Anyone who needs to check ingredients for allergies: it does not publish the list on its site.
- Its figure measures combing breakage on damaged hair against untreated hair, without saying how many samples or what instrument
- It publishes no ingredient list on either its US or its European site
- It carries little water and warms up when wet, according to its question section
- Seven seconds and rinsed out, and its page asks you to keep it off the scalp
- Leave-in time: 7 s
- Salon price
No product on this list matches that case.
Compare the ones you care about
Tick two or three and they will show up here, side by side.
| Product | Label | Figure | How it measured it | In one line | |
|---|---|---|---|---|---|
| Olaplex No.3PLUS Complete Repair Treatment | Figure with no method explained | 3x stronger | — | A short, protein-free pre-shampoo, with a strength figure that says after how many uses, but not against what or what test it ran. | See it on Amazon |
| K18 Leave-In Molecular Repair Hair Mask | Figure with no method explained | 2x more resistant to breakage | — | One of the two that say which bond they repair, explaining what hair it measured on, without saying against what. | See it on Amazon |
| L'Oréal Paris EverPure Bond Repair+ Pre-Shampoo | Figure with no method explained | Different figures in Spain and the US | — | The drugstore one, with almost the same ingredient list and a different claim in each country. | See it on Amazon |
| Kérastase Première Concentré Décalcifiant Repairing Pre-Shampoo | Figure with no method explained | 93% less breakage | — | Its Spain page separates which figures are for the bottle alone, but neither of its two pages says both how it measured and against what. | See it on Amazon |
| Living Proof Triple Bond Complex | Figure with a declared method | 8x stronger | Breakage from combing or brushing, against untreated hair. | The only one telling three types of bond apart, and the one asking for the longest wait before drying. | See it on Amazon |
| Redken Acidic Bonding Concentrate Leave-In Treatment | Figure with no method explained | 1 year of damage in 1 use | — | Its one-year figure was measured with four products from the line and against undamaged hair. | See it on Amazon |
| L'Oréal Professionnel Absolut Repair Molecular Rinse-Off Serum | Figure with no method explained | 2 years of damage in 1 use | — | It says what type of test it ran, but not against what, and its headline figure is for three products. | See it on Amazon |
| Joico Defy Damage In A Flash 7-Second Bond Builder | Figure with a declared method | Up to 20x more resistant to breakage | Combing breakage on damaged hair, against untreated hair. | The fastest of the eight, and one of the two that say in the same note what they measured and against what. | See it on Amazon |
Two name the bond. The other six do not
Put the eight pages in one table and one word keeps coming back, almost never explained: bonds.
Only two say which ones they repair. K18 talks about protein chains and sulfur bridges. Living Proof tells three kinds of link apart and warns that one of them is only repaired with heat. The other six say “bonds”, or “all three bonds”, and leave it there.
It matters because hair is held together by several kinds of link, and they do not all break the same way. Bleaching mostly attacks the sulfur bridges, the ones that carry the structure. Weaker links come apart with water and form again as hair dries, every single day, bleached or not.
So when a label does not say which bond it repairs, read it as a promise of stronger hair. That is a useful promise, though a shorter one than repairing a specific bond.
The No.3 in the comparison is gone from Olaplex’s site
Three comparisons on these pages point at a competitor. One names it; the other two do not.
- The L’Oréal Paris pre-shampoo in Spain says it is as effective as a three-step Olaplex routine, and names the bottles: No.3, No.4 and No.5. The price it quotes for that routine is from 2022.
- Living Proof compares itself with “the leading bond builder”, without saying which.
- The same L’Oréal range in Brazil compares itself with a treatment at a set price, without saying which.
But the No.3 in that comparison is no longer on Olaplex’s site. The brand has replaced it with No.3PLUS, which is exactly the one on this page. The comparison is still on the label, but the rival it was measured against is not the one Olaplex sells today.
For anyone buying, the takeaway is simple: choose by how it is used and what your hair needs, not by who it compares itself with.
Section by section, on the lengths that took the bleach. The root has not been through it yet.
What the citric acid study actually measured
Three of the eight rest their claim on citric acid: the L’Oréal Paris pre-shampoo, Redken and Kérastase, three of L’Oréal’s four. And three L’Oréal researchers have published a study on that acid in bleached, colored or permed hair, in a peer-reviewed scientific journal. It does not test any specific product, but it shows how the company itself explains what the acid does.
The study puts the improvement down, probably, to a mix of routes, including:
- removing calcium from the hair,
- the pH of the treatment,
- strengthening the protein’s network of non-covalent links, the weaker ones mentioned above.
It measures more cross-links between the proteins inside the hair and a firmer fiber that survives many more repeated strains before it breaks. That is real. What its abstract does not mention is sulfur bridges. The labels of those three products, though, talk about repairing or reconnecting bonds. Both can be true at once, though a label that talks about repairing bonds promises more than the study measures. And it is worth knowing that the study is signed by the brand’s own researchers.
The two independent studies do not agree
Outside the brands there is little published, and what there is does not line up.
A 2021 paper tested the chemical family of the Olaplex ingredient on bleached hair. It found no more sulfur bridges inside the fiber. It did see a smoother, more orderly surface, and its authors leave open that the effect could happen in the outer layer.
Another from 2024 tested Olaplex No.0, which carries the same ingredient, and did find more sulfur bridges. In the same work, K18 formed a layer over the fiber.
We are not going to pick one. Independent science is still arguing over whether the Olaplex ingredient rebuilds from the inside. What both saw is that treated hair changes: smoother on the outside in one case, with more sulfur bridges in the other.
Seven seconds, five minutes, or left in
They promise the same thing and get used in very different ways. In practice, that weighs more than the label:
- Before shampoo: Olaplex, Kérastase and the L’Oréal Paris one.
- Quick rinse-off: Joico, in seconds, and the L’Oréal Professionnel serum.
- Left in: K18, Redken and Living Proof, which also asks you to wait before drying.
The best treatment is the one you will actually use. If your routine is five minutes in the shower, a pre-shampoo that asks you to wait will not last long in your bathroom.
Four of the eight come from the same company
Before writing this page we checked who owns each brand, and the answer changes how to read the list.
- L’Oréal owns four: Elvive, Redken, L’Oréal Professionnel and Kérastase.
- Henkel owns two: Olaplex, since July 2026, and Joico.
- K18 is part of Unilever.
So a good share of what looks like the whole category is how a single company labels its products. It explains, for instance, why citric acid shows up three times. No product comes out worse for it; it just gives you the context to read the list.
What we have not done
This page rests on a reading, not on a lab: the eight official pages set side by side and crossed with what science has published. Testing the treatments on hair is outside what we do, and we are not going to pretend otherwise. The cross-reading, though, is something no single label carries.
An at-home treatment keeps up what your colorist achieved at the salon, but it does not replace having them look at your hair. If pieces of hair are left in your brush when you brush it, show them before buying anything.
What people ask
Olaplex or K18?
They do different things and are used at different moments. Olaplex No.3PLUS goes on before shampoo, is rinsed out, and its page does not say which bonds it repairs. K18 is left in and names the ones it says it reconnects: protein chains and sulfur bridges. An independent study tested K18 and Olaplex No.0, which carries the same ingredient, and saw them act differently: one inside the fiber, the other as a layer on the outside. If your hair has just been bleached, K18 is the one its brand recommends for those first washes.
Does this replace the bond treatment at the salon?
No, and it does not try to. The bond protector used during bleaching is a different product: your colorist adds it to the bowl at the salon. These eight are for home, and their instructions are for the shower or damp hair. Their job is to hold on to what the salon achieved, between appointments. And if your wet hair stretches and does not spring back, or comes away in pieces in the brush, show it to your colorist before buying anything.
What happened to Olaplex No.3?
Olaplex has replaced it on its site with No.3PLUS. Its own blog says so: No.3PLUS replaces the original No.3. It presents it as a new three-minute formula, where the old one asked for three to ten. Shops may still have the classic No.3, but if you buy online check the name: one of its old Amazon listings already shows the new product under the old title.
Do they really repair hair bonds?
Independent science does not agree. A 2021 study tested the chemical family of the Olaplex ingredient on bleached hair and found no more sulfur bridges inside the fiber, though it left the outer layer open. Another from 2024 tested Olaplex No.0 and did find more. What both saw is that treated hair changes, on the outside or inside. Getting back the hair you had before bleaching is something else.
Does citric acid repair bonds?
Three of these eight put it at the center of their claim: L'Oréal Paris, Redken and Kérastase, three L'Oréal products. A study by L'Oréal researchers on citric acid, without testing any specific product, puts the improvement down, probably, to a mix of mechanisms, among them removing calcium, pH and strengthening the weaker, non-covalent links. It measures a firmer fiber that survives more repeated strain before breaking. Its abstract does not mention sulfur bridges, and repairing bonds, as the labels of those three promise, is a bigger claim.
Does L'Oréal Bond Repair do the same as Olaplex?
They do not carry the same ingredient. Olaplex uses a maleic acid derivative; the L'Oréal Paris pre-shampoo rests its claim on citric acid. The brand in Spain says its routine is as effective as an Olaplex one, but that routine includes the No.3 Olaplex has since replaced, and the comparison was made with three products. It is the drugstore-priced one and sells under a different name by country: Elvive, EverPure or Elseve.
Before or after shampoo, and for how long?
It depends on the bottle, and this list has everything. Three go on before shampoo: Olaplex, Kérastase and the L'Oréal Paris one, for three to five minutes. Two are quick rinse-offs: Joico, seven seconds, and the L'Oréal Professionnel serum, one or two minutes after shampoo. And three are left in: K18, Redken and Living Proof, which also asks you to wait ten minutes before drying. If your hair was bleached recently, the routine is set by whoever did it.
Sources and method
Every figure on this page comes from the brand’s official page. This is what each one says, in its own words and in the language it publishes them in, and the day we read it.
Olaplex No.3PLUS Complete Repair Treatment
It rebuilds all 3 hair bonds deep in every strand for 360° repair / clinically proven to create 3X stronger,* softer hair.** / *After 4 uses. **Vs. bleached hair. / Leave on for 3 minutes. Rinse. … For best results, use every 1-3 washes. / A 3-minute pre-shampoo treatment / Results achieved by treating hair with Nº.3PLUS Complete Repair Treatment, then cleansing with Nº.4 Bond Maintenance™ Strengthening Shampoo, and conditioning with Nº.5 Bond Maintenance™ Strengthening Conditioner.
Yes, Nº.3PLUS is replacing the original Nº.3.
Sin proteínas ni colorantes / … CI 19140 (amarillo 5), CI 15985 (amarillo 6)
None of the investigated treatments induced an increase in the SS disulfide bridges content of the hair cortex, although it cannot be excluded that this phenomenon could have occurred in the cuticle (Di Foggia et al., Int J Biol Macromol 2021, PMID 33279560)
Olaplex®'s water-based nature creates a visible inner sheet, effectively filling empty spaces and improving the disulfide linkage network. This enhancement was corroborated by the increased number of disulfide bonds (Martins et al., Cosmetics 2024, 11(5):150)
K18 Leave-In Molecular Repair Hair Mask
reconnects both polypeptide chains (and as a result, also reconnects disulfide bonds) / Let sit for 4 minutes. Do not rinse out. / Use for 4-6 washes post-salon service, then as needed. / Shampoo, do not condition. Towel-dry thoroughly. / DON'T use conditioner before applying K18 Mask (you can apply after the 4 min but most find they don’t need it). / The K18PEPTIDE™ is clinically proven to repair damage from bleach + color, chemical services and heat*
2x more resistant to breakage* / Results observed as reduced breakage on bleached hair tress after one application of K18 leave-in molecular repair hair mask / Results observed as improvements in hair strength and elasticity in scientific-technical testing on bleach-damaged fibers after one 4-minute application of K18 molecular repair hair mask
K18®, owing to the lipophilic nature of its constituents, resulted in the formation of an external layer above the fiber (Martins et al., Cosmetics 2024, 11(5):150)
L'Oréal Paris EverPure Bond Repair+ Pre-Shampoo
consigue un 82% más de enlaces capilares reconstruidos y un 98% menos de rotura. / contiene un 12% de complejo reparador de enlaces con ácido cítrico / Dejar actuar durante 5 minutos y después aclarar.
EFICAZ COMO UNA RUTINA DE REPARACIÓN DE 65€* / *Test instrumental realizado vs. Rutina de Olaplex._Nº3, Nº4, y Nº5 valorados todos ellos en 65€.
Results in 3x stronger hair* with 3x less breakage* and 7x less split ends.* / *With use of Pre-Shampoo, Shampoo and Conditioner. / *With use of 4-step system vs. non-conditioning shampoo
Com 18% de Ácido Cítrico, a maior concentração da linha
The observed performance improvements likely stem from a combination of mechanisms, including calcium chelation, the treatment's pH, and reinforcement of the non-covalent protein network. (Zhang, Baghdadli, Greaves, Int J Cosmet Sci 2025, PMID 39757966)
Kérastase Première Concentré Décalcifiant Repairing Pre-Shampoo
Un 93% menos de roturas** / **Test instrumental tras la aplicación de Concentré Décalcifiant Ultra-Réparateur Première / *Test instrumental tras 6 aplicaciones de Concentré … Bain … y Fondant o Masque Première / La concentración de 8% de ácidos puros de este tratamiento tiene una doble acción reparadora: elimina la acumulación de calcio … y lo repara desde el interior reconectando los enlaces de queratina dañados
93% less breakage**** / **** vs. non conditioning shampoo / Apply generously on damp hair before shampoo … Leave on for 5 minutes. / repairs bonds & removes calcium build-up / GLYCINE + CITRIC ACID / Don't rinse and layer Première Bain
Living Proof Triple Bond Complex
Scientifically proven to make hair 8 times stronger** / **Against grooming breakage vs untreated / If heat is not used, the technology will still repair and replenish ionic and hydrogen bonds, but heat must be used to activate the covalent bond repair. / wait 10 minutes before applying other treatments or stylers and blow dry… Use weekly. / Stylists prefer Triple Bond Complex over the leading bond builder
Redken Acidic Bonding Concentrate Leave-In Treatment
Combats 1 year of visible damage in 1 use* / *System of Acidic Bonding Concentrate … Intensive Treatment, Shampoo, Conditioner, and Leave-In Treatment vs. undamaged hair / Apply to clean, damp hair. Leave in. Do not rinse. / Aqua, Dimethicone, Cetearyl Alcohol, Amodimethicone, Phenoxyethanol, Polyquaternium-37, Dimethiconol…
Repara 1 año de daño capilar en un solo uso / No aclarar. Se recomienda utilizar de forma diaria.
L'Oréal Professionnel Absolut Repair Molecular Rinse-Off Serum
¡Repara 2 años de daños, en 1 solo uso 1 ! / ¹Test instrumental en la estructura macromolecular de la fibra después de la aplicación del champú + serúm + mascarilla sin aclarado. / Formulado con Reparador de enlaces + 5 Aminoácidos
Visibly fight 2 years of damage, in 1 use.* / *With system of shampoo + rinse-off serum + leave-in mask. / Use after Absolut Repair Molecular Shampoo and before conditioner or mask
Joico Defy Damage In A Flash 7-Second Bond Builder
Hair is up to 20X more resistant to breakage* / * Against combing breakage on damaged hair vs. untreated / Leave in for 7 seconds. Rinse! / It's best to avoid applying it on the scalp.
What has changed on this page
- First version, with the eight pages read that day. Olaplex was already selling No.3PLUS in place of the classic No.3.
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