The whole formula. A tenth of the commitment.
This is not a diluted or "starter" version — it's the same patented treatment as the full size, just in a 15 mL bottle you can throw in a carry-on.
Bleach, color, chemical services and hot tools break the keratin chains inside the hair fiber. The K18PEPTIDE™ is small enough to reach hair's innermost layer, where it slots into those broken polypeptide chains and reconnects them. Disulfide bonds reconnect as a result, restoring strength across the length and the width of the strand. Four minutes, no rinse, results that survive your next wash.
Two good reasons to start here
Try before you commit. The mask is the most talked-about treatment in the category — over 9,000 reviews and 20+ billion TikTok views — but it's also an investment. 15 mL gives you enough applications to see the difference for yourself (most people notice it by the second or third use) before moving to a full bottle.
Travel without the compromise. Under the 100 mL liquid limit, so it goes straight into your carry-on. Hotel shampoo, hard water in a new city, sun and salt on holiday — this is the one thing that keeps hair together while everything else in your routine is out of reach.
What it repairs
- Bleach + color damage
- Chemical services (relaxers, perms, keratin treatments)
- Heat damage from hot tools and blow-drying
Why it's different from a rinse-out mask
- Rebuilds from the core rather than coating the surface — so strength and elasticity come back, not just slip.
- Repair holds past your next shampoo and compounds with each use.
- Effective on every texture. At the molecular level all hair is structurally the same, so curl pattern and porosity don't change the outcome.
- pH-optimized (5.0–6.0) to limit cuticle swelling and hold hair proteins in their most resilient state.
- Leave-in. No cap, no rinse, no extra minutes in the shower.
Vegan, color-safe, cruelty-free.
Best for
First-time K18 users, frequent flyers, gym bags, and post-salon emergencies. Also worth keeping around if you already own the full size and don't want to travel with it.
How to use
- Shampoo. Skip conditioner. Towel-dry thoroughly.
- Apply 3–9 pumps depending on length and density, starting at the ends and working upward.
- Wait 4 full minutes. Do not rinse.
- Comb through, add stylers, style as usual.
- For a proper reset, use it for 4–6 consecutive washes — then as needed.
Dos and don'ts
Do — clarify first if you use a lot of product or have hard water; buildup blocks the peptide.
Do — apply to clean, damp hair.
Do — wait the full four minutes before touching it.
Do — layer styling products afterward, freely.
Don't — condition beforehand. That film is the one thing that stops it working.
Don't — over-apply. Less is genuinely more.
Don't — rinse it out.
FAQ
Is the mini formula the same as the full size?
Identical. Same peptide, same concentration, smaller bottle.
How many uses will I get?
Depends on length and density — roughly 2–5 applications for long, thick hair, more for short or fine hair. Enough to judge the results.
Can I take it on a plane?
Yes. At 15 mL it's well under carry-on liquid limits.
Why can't I use conditioner first?
Conditioner leaves a film that blocks the peptide from reaching the inner layer. Use it after the 4 minutes if you want — most people find they don't need to.
There's alcohol in the ingredients. Is that a problem?
It's functional. The blend of three alcohols temporarily opens the cuticle so the peptide can reach the broken keratin chains inside.
Ingredients
Water (Aqua) (Eau), Alcohol Denat., Propylene Glycol, Cetearyl Alcohol, Dicaprylyl Ether, Cetyl Esters, Behentrimonium Chloride, Polysorbate 20, sh-Oligopeptide-78, Hydrolyzed Wheat Protein, Hydrolyzed Wheat Starch, Isopropyl Alcohol, Tocopherol, Phenoxyethanol, Potassium Sorbate, Citric Acid, Fragrance (Parfum), Geraniol, Linalool, Hexyl Cinnamal, Benzyl Alcohol, Amyl Salicylate, Benzaldehyde.
*Based on clinical testing. Vegan, color-safe, cruelty-free (Leaping Bunny certified). Contains wheat protein — not gluten-free.
