The Bond Repair Revolution
K18 and Olaplex are the two most talked-about bond repair systems in professional hair care. Both promise to reverse damage — but they work on completely different parts of the hair structure. Here's what you need to know.
How K18 Works
K18 uses a patented bioactive peptide (K18Peptide) that reconnects broken polypeptide chains in the hair cortex. These are the main structural chains of keratin — the same ones shattered by bleach, colour, heat, and chemical services. The K18 Leave-In Molecular Repair Mask works in just 4 minutes, doesn't need to be rinsed out, and the repair is permanent (it stays until the hair is cut or grows out).
How Olaplex Works
Olaplex uses bis-aminopropyl diglycol dimaleate to reconnect broken disulfide bonds — the cross-links between keratin chains. These bonds are broken during every chemical service. Olaplex No. 3 is the at-home treatment; Nos. 1 and 2 are used in-salon during colour services.
Key Differences
Target: K18 = polypeptide chains (main structure). Olaplex = disulfide bonds (cross-links).
Application: K18 = leave-in, 4 minutes, no rinse. Olaplex No. 3 = apply, wait 10+ minutes, rinse out.
When to use: K18 is best post-service or as ongoing repair. Olaplex is best during and after chemical services.
Can you use both? Yes — many professional stylists use both for comprehensive structural repair.
The K18 Product Range
Leave-In Molecular Repair Mask: The hero product. Apply to towel-dried hair, wait 4 minutes, style normally.
PEPTIDE PREP Detox Shampoo: Removes build-up to prep hair for K18 treatment.
PEPTIDE PREP pH Maintenance Shampoo: Gentle daily-use shampoo that maintains K18 results.
Damage Shield Protective Mist: Locks in K18 repair while protecting against heat up to 230°C.
Who Should Use K18?
K18 is ideal for severely bleached hair, hair that feels gummy or stretchy when wet, chemically processed or relaxed hair, and anyone whose hair hasn't responded to traditional conditioning treatments. It's safe for all hair types and all colour services.
Shop K18 at ProHair.ca — authorized Canadian reseller, free shipping over $99.99.