Concept render, product in development
In development · not for sale yet
Hairmetry
Light Conditioner 250 ml
Slip and shine for fine, straight and wavy hair
- straight hair
- wavy hair
- oily scalp
- balanced scalp
- flaky or itchy scalp
- tangles
- dullness
- frizz
- breakage
Free tester with 2 or more products. Checkout opens at launch.
Prices are set at launch.
- How often
- Every wash
- You notice it
- From the first wash
- Every key ingredient links to a study
- No fragrance
Why it works
-
Behentrimonium chloride
A long-chain, positively charged conditioner that clings to hair. In a 2026 lab study it cut wet combing force more than shorter-chain versions.
-
Cetearyl alcohol (a waxy fatty alcohol, not a drying one)
Builds the creamy gel that carries the conditioner. In a lab study with a fatty alcohol, the strongest gel (6 parts behentrimonium to 10 parts alcohol) cut combing force most.
-
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.
-
Hydrolyzed keratin (wool protein fragments)
studied at 0.5% in a conditioner base
Raised the wet breaking force of damaged hair in a lab test. Lab study on cut hair.
-
Amodimethicone (a silicone that sticks to damaged hair)
In lab microscopy, silicone type and amount changed hair's surface friction. A Kao system with amino-silicone added shine to dyed hair. Judged safe as used.
-
Citric acid
Sets a mild acid pH. In an L'Oreal lab study, citric acid treatment raised chemically treated hair's fatigue life 56-124%. Company study; not tested inside a conditioner.
How to use it
- 1After shampoo, smooth through mid-lengths and ends. Keep it off the scalp.
- 2Comb through, leave one minute, 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, Panthenol, Phenoxyethanol, Hydrolyzed Keratin, Amodimethicone, Trideceth-12, Cetrimonium Chloride, PPG-3 Benzyl Ether Myristate, Polyquaternium-10, Ethylhexylglycerin, Citric Acid
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?
Every wash.
Is it right for my hair type?
It is made for straight, wavy hair. The Best for tags at the top list the scalp types and concerns it suits.
When will I notice a difference?
From the first wash.
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.
Light Conditioner 250 ml
Complete the routine
Duo · 2 products
Shower Duo, Light
Daily Shampoo and Light Conditioner for straight and wavy hair
Cleanse the scalp first, then condition the lengths. Both are made for fine to medium hair that goes flat easily.
Save 10% at launch
Routine · 3 products
Fuller Look Routine
Shampoo, conditioner and root lift for hair that sits flat
A light wash and conditioner that do not weigh hair down, plus a spray that lifts at the roots.
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 brush and detangle your hairMost breakage comes from knots, not the comb. Add conditioner, start at the ends, and use a wide-tooth comb.
- How to use conditioner properlyConditioner makes hair slippery so it snags and breaks less. Use it on lengths and ends, not the scalp.
- Dandruff and itchy scalp, explainedDandruff is a reaction to a yeast, not dry skin or dirt. What works, how long to use it, and when to see a doctor.
- How to protect your hair while you sleepWet hair is fragile and tight styles pull. Here is what actually helps at night, and what silk pillowcase claims leave out.
All studies behind this product (12)
Tham HP et al. Electrokinetic analysis reveals common conditioner ingredient interactions with human hair. Int J Cosmet Sci. 2026
Tested: behentrimonium chloride and methosulfate, cetrimonium chloride, stearalkonium chloride
Result: Longer-chain behentrimonium chloride cut wet combing force and deposited best; none reversed oxidative damage.
Read the study ↗Labarre L et al. Hair surface interactions against different chemical functional groups as a function of environment and hair condition. Int J Cosmet Sci. 2023
Result: Hydrophobic interaction drove deposition on virgin hair and electrostatic interaction on bleached hair.
Read the study ↗Robbins C et al. Hair breakage during combing. III. The effects of bleaching and conditioning on short and long segment breakage by wet and dry combing of tresses. 2007
Result: Dry combing breaks the ends more per stroke; wet combing breaks hair higher up; conditioner reduced both short and long breaks.
Read the study ↗Commission Regulation (EU) No 866/2014 amending Annexes III, V and VI to Regulation (EC) No 1223/2009 (cosmetic products)
Result: Behentrimonium chloride is capped at 5.0% in rinse-off and 3.0% in leave-on hair products; cetrimonium chloride at 2.5% rinse-off and 1.0% leave-on; the sum of the three must stay under the stated cap because mixtures can irritate.
Read the study ↗Davies AR, Amin S. Microstructure design of CTAC:FA and BTAC:FA lamellar gels using an automated formulation platform. Int J Cosmet Sci. 2020
Result: Gel structure strength was highest for behentrimonium systems, peaking at a surfactant to fatty alcohol ratio of 6:10, and it affected wet combing.
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 ↗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 ↗La Torre C, Bhushan B. Nanotribological effects of silicone type, silicone deposition level, and surfactant type on human hair using atomic force microscopy. J Cosmet Sci. 2006
Result: Silicone type, deposition level and the cationic surfactant used all changed nanoscale friction and adhesion of hair.
Read the study ↗Watanabe S et al. Formation of nanostructure on hair surface. J Cosmet Sci. 2007
Tested: shampoo and conditioner system with amino-silicone
Result: A very fine surface structure formed on the hair, raising colour intensity and shine and helping dyed hair keep its look.
Read the study ↗Nair B, Cosmetic Ingredient Review Expert Panel. Final report on the safety assessment of stearoxy dimethicone, dimethicone, methicone, amino bispropyl dimethicone, aminopropyl dimethicone, amodimethicone, and related silicones. Int J Toxicol. 2003
Result: The panel judged dimethicone and the amino-silicones safe as used in cosmetics, with minimal absorption.
Read the study ↗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 ↗