Olaplex vs. K18: Which One is Right for Your Hair?

If you’ve been on a journey to revive your hair, you’ve probably heard the buzz about Olaplex and K18. These two powerhouses are leading the way in hair repair—but they work in completely different ways. So, which one is right for you? Let’s break it down so you can decide what your hair truly needs.

How They Work

Olaplex: Bond Builder

Olaplex is a bond-building treatment that works by repairing broken disulfide bonds in your hair. These bonds are the structure inside your hair that takes the hit from coloring, heat, and chemical treatments. The patented technology in Olaplex helps rebuild the hair’s internal structure, making it stronger and healthier over time.

Olaplex is often used and works best as a multi-step treatment, including in-salon services (like Olaplex No. 1 and No. 2) and at-home products (such as Olaplex No. 3, No. 4, and No. 5). It’s a great option for maintaining and protecting hair integrity, especially for those who frequently bleach or color their hair.

K18: Peptide-Based Repair

K18, on the other hand, is a peptide-based treatment designed to repair polypeptide chains within the hair. Think of it as a full reset button for your hair—it reconnects keratin chains, giving you softness, strength, and bounce in just four minutes.

What makes K18 stand out? It’s a leave-in treatment—just shampoo, apply, wait, and style. No rinsing, no fuss. It’s an easy fix for hair that’s been through a lot and needs instant results. While the K18 Leave-In Molecular Repair Hair Mask is the star of the show, the brand also offers complementary products like their shampoo, conditioner, oil, and the latest addition, Airwash Dry Shampoo. But if you’re looking for a holy grail, the mask is the one to start with.

When to Use Olaplex vs. K18

Olaplex is Your Best Friend If:

• You bleach, color, or chemically process your hair often.

• You want long-term strength and repair, not just a quick fix.

• You don’t mind a multi-step system to keep your hair healthy.

• You’re all about preventative care and maintaining hair integrity.

K18 is Your Go-To If:

• Your hair feels damaged and needs a quick comeback.

• You want a one-step, leave-in treatment that works fast.

• You need immediate results in just 4 minutes.

• You want to repair extreme damage at a deeper level.

Can You Use Both?

Definitely! Many hairstylists recommend using both Olaplex and K18, but not at the same time. Since they target different aspects of hair repair, you can alternate them in your routine. For example, you might opt to use Olaplex for weekly at home maintenance and K18 for a quick reset after an intense chemical treatment in the salon, or vice versa. 

Both Olaplex and K18 bring serious benefits to the table—it all depends on what your hair needs most. If you’re in it for long-term protection and strength, Olaplex is your girl. If you need deep, fast repair, K18 is the way to go.

At Kith & Kin Salon, we love customizing treatments to fit your unique hair journey. Have questions? Feel free to reach out to the salon or your stylist—we’re here to help you find your perfect hair rehab routine!