Strengthening & Fortifying Hair Products
421 productsRebuild Broken Bonds — Stronger Hair from the Inside Out
Hair strength isn't just about how it looks — it's about the integrity of every protein bond running through each strand. Bleaching, colouring, heat styling, brushing, and even washing create micro-fractures in the hair's cortex, breaking disulfide bonds that hold the hair's internal structure together. Once enough bonds break, you get the hallmark signs: snapping, excessive shedding, dry brittle texture, and hair that won't grow past a certain length.
Strengthening and fortifying products work in two distinct ways. Protein treatments (like keratin, hydrolyzed wheat protein, and rice protein) coat or penetrate the hair shaft to temporarily fill gaps in the cuticle, adding structure and reducing breakage. Bond-repair technology — pioneered by Olaplex's bis-aminopropyl diglycol dimaleate and now advanced by K18's biomimetic peptide — actually reconnects broken disulfide and polypeptide chains within the cortex, restoring the hair's original strength from within rather than just masking damage.
ProHair.ca carries the most complete selection of strengthening hair care, including Olaplex, K18, Joico K-PAK, Redken Extreme, Schwarzkopf Bonacure Fibre Force, and more. Whether your hair needs emergency bond repair or steady daily fortification, we have the right system — in salon sizes and retail — sourced from authorized distributors.
Strengthening and fortifying products work in two distinct ways. Protein treatments (like keratin, hydrolyzed wheat protein, and rice protein) coat or penetrate the hair shaft to temporarily fill gaps in the cuticle, adding structure and reducing breakage. Bond-repair technology — pioneered by Olaplex's bis-aminopropyl diglycol dimaleate and now advanced by K18's biomimetic peptide — actually reconnects broken disulfide and polypeptide chains within the cortex, restoring the hair's original strength from within rather than just masking damage.
ProHair.ca carries the most complete selection of strengthening hair care, including Olaplex, K18, Joico K-PAK, Redken Extreme, Schwarzkopf Bonacure Fibre Force, and more. Whether your hair needs emergency bond repair or steady daily fortification, we have the right system — in salon sizes and retail — sourced from authorized distributors.
Patented Bond Repair
Clinical Strength
Safe for Colour-Treated
Authorized Seller
Sulfate-Free Options
Shop Strengthening & Fortifying Hair Products by Range
Olaplex
The original bond-repair technology. No. 3 Hair Perfector is an at-home maintenance treatment; No. 4 & 5 are the daily shampoo and conditioner that continue bond repair every wash.
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K18 Biomimetic Hairscience
K18Peptide™ is the first ingredient proven to reconnect polypeptide chains — the deepest level of hair damage. The Leave-In Molecular Repair Mask works in 4 minutes and doesn't wash out.
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Joico K-PAK
A complete reconstruction system built on hydrolyzed keratin and silk. Penetrates the cortex to rebuild from within. Ideal for hair that has lost elasticity and snaps on stretching.
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Redken Extreme
RCT Protein Complex® reinforces the Root, Cortex, and Tip of each strand for whole-strand strength. The Extreme range includes shampoo, conditioner, mask, and a legendary leave-in treatment.
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Schwarzkopf BC Bonacure Fibre Force
Amino Cell Rebuild Technology™ uses targeted amino acids to reconstruct the hair's internal structure. Particularly effective for chemically bleached or highlighted hair.
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Wella Invigo Nutri-Enrich
Goji berry and omega fatty acids (3, 6 & 9) fortify and nourish dry, weakened hair. A gentler strengthening option for hair that isn't severely damaged but needs daily care.
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Kenra Platinum Silkening
Ceramides and silk proteins smooth the cuticle and rebuild the hair's moisture-protein balance, reducing brittleness and improving elasticity over consistent use.
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Vendor:
L'Oréal Professionnel
L'Oréal Professionnel Absolut Repair 100% Professional Nourishing Oil Leave in Repair...
- Regular price
- $36.99
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$29.99 - Sale price
- $36.99
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Joico
Joico K-PAK Clarifying Shampoo – Deep-Cleansing Detox Shampoo for Impurities, Buildup & Pollution
- Regular price
- $32.99
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$42.99 - Sale price
- $32.99
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Joico
Joico Defy Damage Protective Masque – Intensive Strengthening Treatment for Bond Protection
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- $6.99
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$9.99 - Sale price
- $6.99
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Joico
Joico Color Balance Purple Shampoo – Neutralizes Yellow Tones & Brightens Blonde, Silver & Highlighted Hair
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- $32.99
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$42.99 - Sale price
- $32.99
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Joico
Joico Color Balance Blue Shampoo & Conditioner Duo – Neutralizes Orange Tones for Cool, Bright Brunette & Balayage Hair
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- $32.99
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$42.99 - Sale price
- $32.99
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Joico
Joico - K-Pak - Revitaluxe Bio-Advance Restorative Treatment
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- $21.00
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$28.00 - Sale price
- $21.00
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Vendor:
Medavita
B Refibre - Reconstructive Hair Microemulsion 150ml
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- $25.99
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$33.99 - Sale price
- $25.99
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Vendor:
Amika
Amika – The Kure Shampoo
- Regular price
- $40.00
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$84.00 - Sale price
- $40.00
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Oligo Professionnel
Oligo - Calura - Recovery Mask
- Regular price
- $26.00
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$32.00 - Sale price
- $26.00
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Redken
Redken Extreme Length Shampoo – Strength for Long Hair
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- $29.99
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- $29.99
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Redken
Redken Extreme Length Conditioner – Strength for Long Hair
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- $29.99
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- $29.99
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Redken
Redken Extreme Reconstructing Treatment – Strengthening Repair
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- $26.49
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- $26.49
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Redken
Redken Extreme Mask – Strengthening Repair
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- $29.99
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- $29.99
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Vendor:
R+Co
R+Co Dallas Thickening Concentrate Treatment 60ml
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- $59.50
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- $59.50
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Vendor:
Professional By Fama
Professional By Fama Wondher Repair Restorative Mask 500ml
- Regular price
- $49.60
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- $49.60
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Vendor:
Medavita
PRODIGE - HOME Prodige Ultimate Deep Recovering Mask 50ml
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- $31.99
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$41.99 - Sale price
- $31.99
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Vendor:
Oligo Professionnel
Oligo Blacklight Anti-Yellow Violet Shampoo – Toning Cleanser for Blonde, Silver & Highlighted Hair
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- $23.49
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$25.84 - Sale price
- $23.49
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Oligo Professionnel
Oligo - Blacklight - Blue Shampoo
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- $26.99
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- $26.99
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Moroccanoil
Moroccanoil - Smooth shampoo and conditioner duo 16.9 fl.oz/500ml
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- $72.00
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- $72.00
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Moroccanoil
Moroccanoil - Repair Mending Infusion
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- $17.00
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- $17.00
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Medavita
Medavita B-Refibre Reconstructive Shampoo – Strengthening Cleanser for Damaged or Over-Processed Hair
- Regular price
- $32.99
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$42.99 - Sale price
- $32.99
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Vendor:
L'Oréal Professionnel
L'Oréal Professionnel Metal Detox Duo Shampoo + Mask – Anti-Metal Anti-Breakage Care
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- $59.00
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- $59.00
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1N / Black
3N / Ebony Brown
4N / Dark Brown
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Joico
Joico Vero K-PAK Permanent Hair Color – Reconstructive, Long-Lasting Professional Color
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- $10.97
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$27.99 - Sale price
- $10.97
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Vendor:
Joico
Joico K-PAK Shampoo – Reconstructing Cleanser for Damaged, Weak, or Chemically Treated Hair
- Regular price
- $32.99
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$42.99 - Sale price
- $32.99
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Which Strengthening & Fortifying Hair Products Products Are Right for You?
Bond Repair Treatments
Scientifically advanced formulas (Olaplex, K18) that reconnect broken disulfide and polypeptide bonds deep inside the cortex. The most powerful repair available without a salon visit.
Protein Treatments
Hydrolyzed keratin, silk, and wheat protein formulas that fill cuticle gaps and add temporary structural support. Best for hair that is limp, overly elastic, or prone to breakage.
Strengthening Shampoos
Daily-use cleansers that build fortification into every wash. Won't replace a treatment, but maintain and extend the results of your protein or bond-repair routine.
Fortifying Conditioners
Rinse-out conditioners with structural proteins and ceramides that add slip and strength simultaneously — reducing breakage during detangling and brushing.
Leave-In Strengtheners
Heat-activated or ambient-working leave-in treatments (like K18) that continue to repair bonds after application, every time you style or wash.
Deep Repair Masks
Intensive weekly treatments with concentrated protein and bond-building actives. Used 1–2 times per week on damaged or chemically processed hair.
Frequently Asked Questions
What's the difference between bond repair (Olaplex, K18) and protein treatments?
Protein treatments (keratin, hydrolyzed wheat/silk protein) fill in the gaps in the hair's outer cuticle layer, adding surface strength and reducing porosity. Bond repair technology (Olaplex's bis-aminopropyl diglycol dimaleate, K18's biomimetic peptide) works inside the cortex to actually reconnect broken disulfide bonds and polypeptide chains — the hair's fundamental structural connections. Bond repair produces deeper, more lasting results; protein treatments are a useful complement for surface conditioning and elasticity.
How often should I use Olaplex No. 3?
Olaplex recommends using No. 3 Hair Perfector at least once a week on healthy hair, and 2–3 times per week on severely damaged, bleached, or brittle hair. Apply to damp hair, leave for 10+ minutes (overnight works well for very damaged hair), then shampoo and condition as normal. Consistent weekly use is more effective than infrequent intensive use.
My hair is protein-sensitive — will strengthening products make it worse?
Some hair (often fine, low-porosity, or already protein-overloaded hair) reacts badly to heavy protein treatments — becoming stiff, rough, or more brittle. If you're protein-sensitive, avoid products with hydrolyzed keratin or wheat protein as the first or second ingredient. Bond repair formulas (Olaplex, K18) are generally better tolerated because they use small bond-building molecules rather than large protein films. Biolage Fiberstrong (bamboo extract) is also a gentler option.
Can I use K18 and Olaplex in the same routine?
Yes, and many stylists recommend it. They work on different mechanisms: Olaplex reconnects disulfide bonds; K18 reconnects polypeptide chains. Using both covers more of the damage spectrum. A common approach: use Olaplex No. 3 as your pre-wash treatment once a week, and apply K18 Leave-In after your Olaplex shampoo and conditioner wash.
How long does it take to see results from a strengthening routine?
With bond repair treatments like Olaplex or K18, many people notice reduced breakage and improved elasticity after 2–3 applications. Full restoration of severely damaged hair takes 4–8 weeks of consistent use. Protein treatments show results more immediately but are temporary — they wash out over time. For the longest-lasting results, use bond repair as the base and protein treatments as a complement.
Is Redken Extreme good for bleached hair?
Yes. Redken Extreme's RCT Protein Complex is well-suited for bleached and colour-processed hair. However, for severely compromised bleached hair (hair that has turned mushy, extremely porous, or is snapping at the root), Olaplex or K18 should be the priority treatment, with Extreme used as the daily maintenance shampoo and conditioner.
Are salon sizes of Olaplex or K18 worth buying?
If you use these products consistently — which you should to see results — salon sizes are significantly more economical. Olaplex No. 3 in 250ml costs considerably less per ml than the 100ml retail size. On ProHair.ca, we stock both retail and salon sizes across the Olaplex and K18 lines at the same authorized prices your salon pays.
Why Buy From ProHair?
ProHair.ca is an authorized seller of Olaplex, K18, Joico, Redken, Schwarzkopf, Wella, and Kenra — sourced directly through official authorized distributors. Every strengthening product we sell is 100% authentic, properly stored, and backed by the brand's quality guarantee. We've been trusted by hair professionals and home users since 1996. Free shipping on orders over $99.99 across North America.
