K18 Routine: Repair Damaged Hair with 3 Products

Discover K18 Biomimetic Hairscience at Colorful Black K18 Biomimetic Hairscience Routine: deeply repair damaged hair with 3 products Three products. One repair logic. From clarifying shampoo to patented mask, complemented by a lightweight, silicone-free oil — here's how to combine them to get the most out of K18 technology. K18 is not a traditional haircare brand. Its formulas don't just coat the hair's surface: they work inside the hair fiber, at a molecular level, to reconnect keratin chains broken by bleaching, coloring, chemical treatments, and heat. For this technology to work fully, each step of the routine has its role — and it's important to follow them. Here's how we recommend using the three K18 products available at Colorful Black. Step 1: Prepare clean hair with Peptide Prep™ Detox Shampoo The performance of any hair treatment largely depends on the cleanliness of the hair it's applied to. Residues from styling products, sebum, metals in tap water, and minerals form a layer on the hair fiber that literally blocks the penetration of active ingredients. This is true for any treatment — and even more so for K18PEPTIDE™, whose effectiveness relies on its ability to reach the deep layers of the hair. Peptide Prep™ Detox Shampoo was specifically designed to solve this problem. It's not an everyday shampoo: it's a clarifying shampoo to be used once a week, or before each application of the K18 mask. K18 • Peptide Prep™ Detox Shampoo is formulated around three complementary active ingredients. Activated charcoal absorbs toxins, excess sebum, and impurities accumulated on the scalp. Salicylic acid deeply cleanses hair follicles without drying or stripping. And K18PEPTIDE™, incorporated in a microdose, works protectively: it reduces protein loss during washing so that the hair does not emerge weakened after intense cleansing. The result is measured: after a single wash, the shampoo removes 99% of product residue, 95% of sebum, and reduces copper concentration by 76% — a common metal in tap water that dulls and weakens the hair fiber. The formula is pH-optimized, color-safe, and leaves no residue behind. This is the starting point for any effective K18 routine. Perfectly clean hair before applying the mask is the condition for the peptide to go where it needs to go. Step 2: Deeply repair with the Leave-in Molecular Repair Hair Mask This is K18's flagship product. The one that built the brand's reputation in professional salons worldwide, before becoming a mainstream bestseller. The one that users reorder. And the one whose promise — to repair hair in 4 minutes — is clinically proven. K18 • Leave-in Molecular Repair Hair Mask is a leave-in mask formulated around the patented K18PEPTIDE™. Its molecular structure is designed to penetrate to the hair's cortex — its deepest layer — and precisely insert itself at the breaking points of keratin chains. It reconnects polypeptide bonds and disulfide bonds broken by chemical and thermal damage, restoring hair's strength and elasticity from within. What sets it apart from other reparative treatments: once in place, it doesn't rinse out with the next shampoo. The peptide is recognized by the hair fiber as natural — that's the very principle of biomimetics — and it remains anchored in the hair structure. The results are therefore long-lasting and accumulate with each use. Clinically, after two uses on hair bleached eight times, K18PEPTIDE™ restores up to 82% of damage. Most users notice a visible transformation after the 2nd or 3rd application. How to use: After shampooing, wring out hair well and do not apply conditioner. Conditioner deposits a film on the fiber that would block the peptide's entry. Apply 1 to 3 pumps of the mask to the lengths, from tips to roots, depending on your hair density. Leave on for exactly 4 minutes. Do not rinse. Then style normally. For an initial treatment, repeat for 4 to 6 consecutive washes, then use as needed. Step 3: Complete and finish with Molecular Repair Hair Oil Molecular Repair Hair Oil is the third piece of the K18 routine — and it plays a dual role. It's both a reparative treatment and a lightweight finishing oil, usable on damp or dry hair. K18 • Molecular Repair Hair Oil is a lightweight, silicone-free oil, formulated with K18PEPTIDE™ and a complex of natural oils: squalane, organic avocado oil, sunflower oil. It acts on two levels of the hair fiber. On the surface, natural oils smooth the cuticle, reduce frizz and split ends, and add shine without weighing down or leaving a greasy residue. Deep down, the peptide continues its molecular repair work. It also provides heat protection up to 232°C — making it a valuable ally for anyone who uses a diffuser, hairdryer, or straightener in their routine. How to use: On towel-dried damp hair, apply 1 to 3 drops from mid-lengths to ends and wait 4 minutes before styling to fully benefit from the peptide. On dry hair, apply 1 to 3 drops as a finish to smooth, control, and reveal shine. The formula is highly concentrated: always start with a small amount and adjust according to your hair density. It is ideally used after the K18 mask, once the 4 minutes have passed, to combine internal repair with styling benefits. How to build your daily K18 routine K18 doesn't replace a complete hair care routine: it strengthens and repairs it. Here's how to consistently integrate the three products. An important warning first: the K18 mask is used without prior conditioner. This is the main rule to follow for the peptide to penetrate effectively. Once the 4 minutes of waiting time are over, you can resume your usual routine — moisturizing leave-in, then styling product to seal in hydration. K18 does not hydrate: it repairs the structure. Leave-in remains essential, especially for curly, coily, and kinky hair. Initial treatment (4 to 6 washes): Peptide Prep™ Detox Shampoo → squeeze out excess water → K18 Leave-in Molecular Repair Hair Mask (4 min, do not rinse) → Molecular Repair Hair Oil on damp hair → your routine's leave-in → styling product. Maintenance (depending on hair condition): Peptide Prep™ Detox Shampoo once a week → K18 mask as needed → oil as a finish on damp or dry hair. Daily: Molecular Repair Hair Oil on dry hair as a finish, 1 to 3 drops. The more damaged the hair is initially, the more pronounced the results of the initial treatment will be. This is the very logic of K18PEPTIDE™: there are many breakage points, the peptide has more to reconnect, and the transformation is all the more visible. Buy K18 at Colorful Black: in store in Paris or online We selected these three products because we tested the K18 logic, because we understand which hair types it is for, and because we are able to guide you in their precise use. If you have bleached, colored, permed, chemically straightened hair, or simply hair weakened by years of intense heat, K18 is a serious solution. If you're unsure about the format or how to integrate K18 into your existing routine, our in-store team is there to guide you — and you can also contact us via the chat on our website. Products to discover K18 • Peptide Prep™ Detox Shampoo (clarifying shampoo) K18 • Leave-in Molecular Repair Hair Mask (leave-in repair mask) K18 • Molecular Repair Hair Oil (lightweight repair oil) View the entire K18 Biomimetic Hairscience selection at Colorful Black

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K18 Routine: Repair Damaged Hair with 3 Products

K18 • Leave-in Molecular Repair Hair Mask

K18 • Huile Capillaire Réparatrice Moléculaire