K18, Olaplex & Bond Repair Treatments: What They Do and When You Need One

If you have ever heard the words K18 or Olaplex in a salon and wondered what they actually do, you are not alone. These treatments have become some of the most talked-about products in professional hair care — and for good reason. But understanding what they are, how they differ, and when you actually need one will help you make a smarter decision for your hair.

All hair is made up of protein bonds called disulfide bonds. These bonds give hair its strength, elasticity, and structure. Colouring, bleaching, heat styling, and chemical treatments — like perms or keratin — all break down these bonds over time. When enough bonds are damaged or broken, the hair becomes weak, brittle, dry, and prone to breakage. This is where bond repair treatments come in.

Olaplex was one of the first bond-building products to reach professional salons. It works by reconnecting broken disulfide bonds inside the hair shaft. It can be used as a standalone treatment or added directly into a colour or bleaching formula to protect the hair during the lightening process. Olaplex has several steps — some used in the salon, others designed for home use to maintain the results between appointments.

K18 works differently. Rather than targeting disulfide bonds directly, K18 uses a synthetic peptide that penetrates the hair cortex and repairs damage to the polypeptide chains — a deeper level of the hair's internal structure. It works in as little as four minutes and does not need to be rinsed out. Many clients notice a significant improvement in softness, strength, and elasticity after just one treatment. K18 is often used as a stand-alone add-on at the end of a colour service.

Both treatments are effective, but they target slightly different types of damage and work through different mechanisms. Olaplex has a longer track record and a wider range of home maintenance products. K18 is newer but has gained a strong reputation for delivering fast, noticeable results — particularly for hair that has been significantly lightened or chemically processed. At Elika Beauty, we use the treatment that best suits your hair's specific condition.

You might benefit from a bond repair treatment if your hair feels dry, rough, or gummy when wet. If it breaks easily, lacks elasticity, or has lost its shine despite regular conditioning, that is often a sign that the internal structure has been compromised. Hair that has had multiple lightening services, colour corrections, or chemical treatments over time is especially likely to benefit.

These treatments are not just for damaged hair. Adding a bond treatment to a colour or bleaching appointment is a smart way to protect the hair during the service and reduce the wear that lightener places on the structure. Many clients include it as a regular part of their colour appointments to keep their hair in the best possible condition over time.

If you are not sure whether your hair needs a treatment, book a consultation. We can assess your hair's condition and recommend the right approach — whether that is a standalone repair treatment, an in-colour add-on, or a home care routine that helps maintain the results between visits.