Concept render, product in development
In development · not for sale yet
Hairmetry
Repair Mask 200 ml
Weekly reinforcement for bleached, heat-styled or brittle hair
- straight hair
- wavy hair
- curly hair
- coily hair
- oily scalp
- balanced scalp
- dry scalp
- flaky or itchy scalp
- breakage
- chemical damage
- heat damage
- split ends
- dryness
- dullness
- frizz
Free tester with 2 or more products. Checkout opens at launch.
Prices are set at launch.
- How often
- Once a week
- You notice it
- Smoother from the first use
- Every key ingredient links to a study
- No fragrance
Why it works
-
Citric acid
A mild acid used here for a low pH. In an L'Oreal lab study, citric acid treatment cut calcium 21-42% in chemically treated hair and raised fatigue life 56-124%.
-
Hydrolyzed keratin (wool protein fragments)
studied at 0.5% in a conditioner base
Raised the wet breaking force of bleached, permed and heat-damaged hair. It also kept hair strength after UV light in a lab test.
-
Hydrolyzed wheat protein
studied at 2%, with wheat starch
Gave the biggest strength gain in dry bleached and heat-straightened hair. Wheat-derived: skip it if you react to wheat.
-
Panthenol (pro-vitamin B5)
A small molecule that enters hair and probably binds to its protein. In a Procter and Gamble lab test it raised break stress and stiffness.
-
Ceramide NP
A hair-surface lipid. In lab tests, ceramide-treated damaged hair kept lower friction and bent more easily. Small studies; ceramide type not named.
-
Coconut oil
In an industry study, a coconut-based hair oil limited the extra pores that washing opens in hair and reversed the loss of break stress.
How to use it
- 1After shampoo, comb through mid-lengths and ends. Keep it off the scalp.
- 2Leave for 5 minutes, then rinse well.
What's not in it
Added fragrance and fragrance allergens
Fragrance is a main cause of contact allergy. In one clinic series, 15.7% of dermatitis patients reacted to a fragrance. Linalool and limonene appear in about half of fragranced products.
Essential oils
Natural does not mean gentle. In 62,354 patch-tested clinic patients, 1.4% reacted to an essential oil alone. Ylang-ylang, sandalwood, jasmine, peppermint and oxidised tea tree oil led.
MI / MCI preservatives
MI drove a rise in contact allergy in Europe. EU banned it from leave-ons in 2017; rinse-off is capped at 15 ppm. About 3 in 100 tested patients react.
Formaldehyde-releasing preservatives
These preservatives slowly release formaldehyde, a known skin allergen. A 2022 clinical review says they still cause dermatitis, sometimes without being listed on the label.
Zinc pyrithione
Banned in EU cosmetics from March 2022 as toxic for reproduction (hazard class). EU experts judged it safe in rinse-off anti-dandruff shampoo up to 1%, but no exemption was granted.
Harsh sulfates in daily products
SLS is the standard irritant control in skin patch tests. A gentler cleanser, sodium lauroyl glutamate, irritated far less in 15 people. Fine for an occasional deep clean, not daily.
Coal tar
Coal tar can cause folliculitis, irritation and allergy, and contains carcinogens seen in animals and workers (patients show no clear tumour rise). A non-tar shampoo matched it in one trial.
Methyldibromo glutaronitrile
A preservative the EU banned in all cosmetics because allergy kept rising. In Denmark, positive allergy tests fell from 4.6% to 2.6% after the ban.
Full ingredient list (proposed formula)
Aqua, Cetearyl Alcohol, Behentrimonium Chloride, Cocos Nucifera Oil, Panthenol, Hydrolyzed Keratin, Hydrolyzed Wheat Protein, Phenoxyethanol, Amodimethicone, Trideceth-12, Cetrimonium Chloride, Citric Acid, Ceramide NP, Ethylhexylglycerin, Tocopherol
A proposed formula for a product in development. Final levels are set by a cosmetic chemist and tested for stability and safety before any sale.
Frequently asked
How often can I use it?
Once a week.
Is it right for my hair type?
It is made for straight, wavy, curly, coily hair. The Best for tags at the top list the scalp types and concerns it suits.
When will I notice a difference?
Smoother from the first use.
Does it contain fragrance?
No. It has no added fragrance or essential oils, and the full ingredient list is on this page.
Is it medicine?
No. It is a cosmetic that cares for hair and scalp. It does not treat disease. For hair loss, talk to a doctor.
Can I buy it yet?
Not yet. It is in development, so the formula can still change. Checkout opens at launch.
Repair Mask 200 ml
Complete the routine
Routine · 4 products
Repair Routine
Pre-wash oil, reset wash, mask and heat protection for worn hair
Oil before the wash, an occasional reset wash, a weekly mask and heat protection before styling.
Save 15% at launch
Sets are cosmetics for hair and scalp. They do not treat disease. For hair loss, talk to a doctor.
Pairs well with
Read more
- How to use conditioner properlyConditioner makes hair slippery so it snags and breaks less. Use it on lengths and ends, not the scalp.
- Hair damage and repairDamage cannot be healed, only reduced, smoothed or cut off. What bleach, heat, bond builders, oils and trims really do.
- Heat styling without frying your hairHeat damage rises with temperature, time and repeat passes. Dry hair first, go as low as you can, and pass as few times as possible.
All studies behind this product (12)
Zhang D et al. Reinforcing chemically treated human hair with citric acid. 2025
Tested: citric acid treatment
Result: Citric acid reduced calcium in chemically treated hair by 21-42% and improved mechanical properties.
Read the study ↗Malinauskyte E et al. Effect of equilibrium pH on the structure and properties of bleach-damaged human hair fibers. Biopolymers. 2020
Result: Bleached hair took up more water and swelled more at alkaline pH, and less at pH 3.
Read the study ↗Daniels G, Nicholson S, Grant-Ross P, Tamburic S. An ex vivo comparison of the tensile-strengthening properties of protein derivatives on damaged hair. IFSCC Magazine. 2016
Tested: cationic emulsion base (1% cetrimonium chloride) with hydrolysed keratin 0.5%, hydrolysed wheat protein plus wheat starch 2%, or hydrolysed collagen 2%
Result: All three proteins raised wet breaking force on all three damage types, keratin most; wheat protein plus starch gave the biggest gain in dry hair, especially bleached or heat-straightened; small university study, one hair source.
Read the study ↗Fan J et al. Performance and mechanism of hydrolyzed keratin for hair photoaging prevention. Molecules. 2025
Tested: hydrolysed keratin treatment before UV
Result: Hydrolysed keratin deposited on the cuticle and partly penetrated; treated hair kept its tensile strength after UV while untreated hair lost 14.32%.
Read the study ↗Burnett C et al. Safety assessment of hydrolyzed wheat protein and hydrolyzed wheat gluten as used in cosmetics. Int J Toxicol. 2018
Result: The Cosmetic Ingredient Review panel judged hydrolysed wheat protein safe in cosmetics when average molecular weight is 3,500 Da or less.
Read the study ↗Marsh JM et al. Strengthening benefits of panthenol for hair: mechanistic evidence from advanced spectroscopic techniques. Int J Cosmet Sci. 2026
Result: Labelled panthenol penetrated into cortical protein regions and raised break stress and elastic modulus, probably through hydrogen bonding.
Read the study ↗Scott LN, Fiume M, Bergfeld WF et al. Safety assessment of panthenol, pantothenic acid, and derivatives as used in cosmetics. Int J Toxicol. 2022
Result: The Cosmetic Ingredient Review panel judged panthenol and pantothenic acid safe as used in cosmetics, where they act as hair conditioners and humectants.
Read the study ↗Morita T et al. Glycolipid biosurfactants, mannosylerythritol lipids, repair the damaged hair. J Oleo Sci. 2010
Tested: ceramide versus lauryl glucoside alone versus two glycolipids
Result: Ceramide-treated damaged hair had slightly higher tensile strength (100.7 vs 96.7 gf/p, no significance stated), kept a lower friction coefficient (0.111 vs 0.126) and lower bending rigidity (0.164 vs 0.204) than the surfactant-only control; the glycolipids did best.
Read the study ↗Mendez S et al. Damaged hair retrieval with ceramide-rich liposomes. 2011
Tested: wool internal lipid (ceramide-containing) liposomes
Result: Lipids were recovered, resistance to break rose and hydrogen bonding and electrostatic forces increased in treated hair.
Read the study ↗Burnett CL et al. Safety Assessment of Ceramides as Used in Cosmetics. Int J Toxicol. 2020
Result: The Cosmetic Ingredient Review panel judged ceramides, which function as hair-conditioning and skin-conditioning agents, safe as used in cosmetics.
Read the study ↗Kaushik V et al. Benefit of coconut-based hair oil via hair porosity quantification. Int J Cosmet Sci. 2022
Result: Repeated surfactant washing raised pore surface area in an industry study; pre-treatment with coconut-based oil limited it.
Read the study ↗Rele AS, Mohile RB. Effect of mineral oil, sunflower oil, and coconut oil on prevention of hair damage. J Cosmet Sci. 2003
Tested: mineral, sunflower and coconut oil
Result: Mineral oil did not reduce protein loss from combing in either undamaged or damaged hair; coconut oil did.
Read the study ↗