K18PEPTIDE PREP™ Color-Safe Detox Clarifying Shampoo, Non-Stripping, pH-Optimized Cleanse, Removes Product Buildup, Dirt, Oils & Metals, 8.5 Fl Oz

After testing the K18 Peptide Prep Detox Shampoo for two weeks, I’m genuinely impressed with its performance. As someone with color-treated, heat-styled hair, I’m always looking for products that detox the scalp and strands without leaving my hair feeling dry or over-cleansed — and this delivered exactly that.Cleansing Power:This shampoo provides a deep, clarifying cleanse that removes product buildup, excess oil, and environmental residue in just one wash. My scalp felt noticeably cleaner, and my hair had more natural volume at the roots. It’s strong enough to reset your hair without feeling harsh or over-drying.Gentleness & Formula:Despite the deep-cleaning effect, it doesn’t strip the hair. It’s sulfate-free and feels balanced — no squeaky or tangled feeling afterward. It lathers well with just a small amount, and the clean, subtle scent is refreshing without being overwhelming.Compatibility:It works especially well as a prep step before using bond-building or peptide-based treatments like the K18 leave-in molecular repair mask. I noticed that post-shampoo treatments seemed to absorb better and left my hair feeling smoother and stronger.✅ Pros:Deep-cleansing without drynessGreat prep for repair/bonding treatmentsClean scent, good latherSafe for color-treated and damaged hairA little goes a long way❌ Cons:Not intended for everyday use — best 1–2x per week (but that’s typical for clarifying products)

The best detox shampoo I have ever used. I have used several brands and this is the only one that does not make my hair feel like the bottom of the broom. I love that it does not take away too much of my hair color, but it properly cleanses with ease, bottle is great quality no leakage. Great value for your money. I would recommend 20/10.

I’ve tried a few K18 products, and my experience has been mixed. The K18 Detox Shampoo is a standout—it deeply cleanses without drying out my hair, and it really helped clear up product buildup. My scalp felt fresh, and my hair looked noticeably cleaner and more vibrant.The Molecular Repair Hair Mask also lived up to the hype. After just a couple uses, my hair felt softer, stronger, and healthier. It’s lightweight, and I love that it repairs without needing to be rinsed out.Unfortunately, the K18 Peptide Prep Shampoo, Conditioner, and Hair Oil didn’t work for me. They left my hair feeling dry, dull, and lifeless—even after just one use. For the price, I expected better results.Overall, I’ll stick to the Detox Shampoo and Repair Mask, but I won’t be repurchasing the rest.

This shampoo is amazing! I use it once a week and it cleans and clarifies my hair leaving no build up or residue. My hair is left soft and flowy and not weighed down. It’s a little pricey but I feel the benefits are well worth it. It doesn’t take much to wash your hair so it lasts a good while.

I have seborrheic dermatitis and have struggled to find a shampoo that smells decent and works well for flakes. I've tried Selsun Blue, Head and Shoulders, Nizoral, coal tar shampoos including Pete and Pedro Control shampoo. They either don't work or stink to high heaven. I don't know any woman who would be ok with smelling like coal tar for days. This shampoo works well on my thick, color-treated hair and doesn't dry it out. A little goes a long way. It smells ok, not overly perfume-y. K18 is a great line and although pricey, my hair and scalp are the healthiest they've been in a long time!

I swim laps in chlorinated pools. This shampoo has saved my highlighted hair. It's a bit expensive but a very small amount of product does the trick

Works well but too expensive, there are cheaper drugstore brands that will clarify just as well.

Love this shampoo. I oil my hair weekly, and then dry shampoo with this and it gets all the oil out completely. Never had any issues with this. Highly recommend