Concept render, product in development
In development · not for sale yet
Hairmetry
Reset Shampoo 250 ml
Deep clean that lifts buildup, hard-water minerals and chlorine
- straight hair
- wavy hair
- curly hair
- coily hair
- oily scalp
- balanced scalp
- dry scalp
- flaky or itchy scalp
- buildup
- hard water
- dullness
Free tester with 2 or more products. Checkout opens at launch.
Prices are set at launch.
- How often
- Every 2 to 4 weeks, or after swimming
- You notice it
- From the first wash
- Every key ingredient links to a study
- No fragrance
Why it works
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Citric acid (mineral binder)
Binds calcium. In an L'Oreal lab study of chemically treated hair, citric acid treatment cut hair calcium 21-42% and raised fatigue resistance 56-124%.
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Glutamate diacetate, GLDA (chelator)
A chelator, which binds metal ions such as calcium and copper. Copper from water can tint blond hair green. Judged safe as used by the CIR panel (2025).
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Sodium phytate (plant chelator)
A plant-derived mineral binder used with GLDA. Judged safe as used in cosmetics by the CIR panel. No hair trial; chosen for its chemistry.
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Sodium lauroyl sarcosinate (stronger cleanser)
The stronger cleanser here, for oils and styling residue. The CIR panel judged it safe in rinse-off products. Mixed with mild cleansers, used only every few weeks.
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Betaine
Lowered detergent irritation in a 21-person forearm patch test, so it may soften a deeper clean. Not tested in this formula.
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Panthenol (pro-vitamin B5)
Enters hair and raised its break stress in a lab test. Judged safe as used in cosmetics.
How to use it
- 1Use in place of your usual shampoo. Lather twice if hair is coated.
- 2Always follow with conditioner.
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.
Drying alcohol in leave-ons
In 15 volunteers, strong alcohols lowered skin hydration without breaking the barrier. A mild effect, so a caution for dry or sensitive scalps. Fatty alcohols like cetyl alcohol are fine.
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, Sodium Lauroyl Sarcosinate, Sodium Lauroyl Methyl Isethionate, Disodium Cocoamphodiacetate, Tetrasodium Glutamate Diacetate, Glycerin, Citric Acid, Betaine, Sodium Phytate, Panthenol, Sodium Chloride, Phenoxyethanol, Ethylhexylglycerin, Sodium Hydroxide
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 2 to 4 weeks, or after swimming.
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?
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.
Reset Shampoo 250 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
All studies behind this product (17)
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 ↗Smart KE et al. Copper and calcium uptake in colored hair. 2009
Result: Calcium concentrated in the sulfur-rich layers of the cuticle of coloured hair; copper uptake can add to damage during later colouring.
Read the study ↗Burnett CL, Bergfeld WF, Belsito DV et al. Safety assessment of tetrasodium glutamate diacetate and beta-alanine diacetic acid as used in cosmetics. Int J Toxicol. 2025
Result: The Cosmetic Ingredient Review panel judged tetrasodium glutamate diacetate (GLDA), a chelator that binds metal ions, safe as used in cosmetics.
Read the study ↗Mascaro JM Jr et al. Green hair. Cutis. 1995
Result: Green tints in blond hair came from copper in household or pool water, favoured by prior hair damage, chlorinated water and alkaline shampoos.
Read the study ↗Srinivasan G et al. Scanning electron microscopy of hair treated in hard water. Int J Trichology. 2016
Tested: hard water (about 212 ppm CaCO3) versus distilled water, 10 minutes on alternate days
Result: Hard-water hair carried more calcium (0.804% versus 0.26%) and magnesium (0.34% versus 0.078%), had a ruffled cuticle and slightly smaller thickness (72.78 versus 78.14 micrometres).
Read the study ↗Danby SG et al. The Effect of Water Hardness on Surfactant Deposition after Washing and Subsequent Skin Irritation in Atopic Dermatitis Patients and Healthy Control Subjects. 2018
Tested: SLS washing in water of different hardness
Result: Hard-water sites retained more SLS, with higher water loss through the skin and more irritation, most strongly in people with filaggrin gene mutations.
Read the study ↗Johnson W Jr, Bergfeld WF, Belsito DV et al. Safety assessment of polyol phosphates as used in cosmetics. Int J Toxicol. 2024
Result: The Cosmetic Ingredient Review panel judged phytic acid and sodium phytate (chelators) safe as used in cosmetics.
Read the study ↗Lanigan RS et al. Final report on the safety assessment of Cocoyl Sarcosine, Lauroyl Sarcosine, Myristoyl Sarcosine, Oleoyl Sarcosine, Stearoyl Sarcosine, Sodium Cocoyl Sarcosinate, Sodium Lauroyl Sarcosinate, Sodium Myristoyl Sarcosinate, Ammonium Cocoyl Sarcosinate, and Ammonium Lauroyl Sarcosinate. 2001
Result: Used as hair-conditioning and cleansing agents; low oral toxicity in rats; not mutagenic in tested cells; carcinogenicity data not available.
Read the study ↗Zhao H et al. The impacts of sodium lauroyl sarcosinate in facial cleanser on facial skin microbiome and lipidome. 2024
Tested: facial cleanser containing sodium lauroyl sarcosinate
Result: No extensive effect on skin physical parameters; decreased porphyrin; some microbiome and lipid measures shifted.
Read the study ↗Nicander I, Rantanen I, Rozell BL, Söderling E, Ollmar S. The ability of betaine to reduce the irritating effects of detergents assessed visually, histologically and by bioengineering methods. Skin Res Technol. 2003
Tested: sodium lauryl sulfate or cocamidopropyl betaine with and without betaine
Result: Adding betaine lowered the irritant reaction to both detergents. Short patch test on forearm skin, not a shampoo trial.
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 ↗Nanko H et al. Hair-discoloration of Japanese elite swimmers. J Dermatol. 2000
Result: 61% of swimmers had hair discoloration versus 0% of controls; affected hair had lost its cuticle, had fewer melanosomes, less sulfur and detectable chlorine.
Read the study ↗Millington KR et al. UV damage to hair and the effect of antioxidants and metal chelators. J Cosmet Sci. 2020
Result: UV damage to hair was affected by antioxidants and metal chelators in the lab.
Read the study ↗Gavazzoni Dias MF et al. The Shampoo pH can Affect the Hair: Myth or Reality? Int J Trichology. 2014
Result: 38% were at or below pH 5.5 and 62% above; 81% of 26 anti-dandruff shampoos and all children's shampoos were above 5.5 (range 3.5-9.0). Alkaline pH may raise fibre charge, friction and cuticle damage; a measurement and mechanism review, not a wear trial.
Read the study ↗Dréno B, Zuberbier T, Gelmetti C, Gontijo G, Marinovich M. Safety review of phenoxyethanol when used as a preservative in cosmetics. J Eur Acad Dermatol Venereol. 2019
Result: Phenoxyethanol is a rare sensitizer with only a weak effect on skin's own microbes. EU experts judge it safe for all consumers, children included, at up to 1% as a preservative.
Read the study ↗Hossel P et al. Conditioning polymers in today's shampoo formulations: efficacy, mechanism and test methods. Int J Cosmet Sci. 2000
Result: Polyquaternium-7, polyquaternium-10 and cationic guar all improved combing, but differed in build-up and removability.
Read the study ↗