Jack Black
Double-Header® Shampoo + Conditioner
hair16oz
Raters split
Ingredient safety
A 69-point gap between the two loudest voices.
16Greenlens Ingredient ScanIndependent
vs85Health Canada Ingredient HotlistGovernment
050100
See why, ingredient by ingredientCleaner options
See 12 cleaner alternatives
Same category, ranked by ingredient safety, never by affiliate payout.
Every rater, every axis
Ingredient safety
Split · 69 pts apart- 85
- 16
- 64
- 55
- 60
Lowest 16 · highest 85 · gap 69
Also screened — no listing found
Environmental
- 86
Labor
- 85
Coverage & match quality
7 ratings · 3 of 4 axes
- Some ratings rest on an automatic match that has not been human-reviewed.
- Fewer raters reach smaller-brand products, so a missing rating is not a clean bill of health, only a gap.
no black box
How this score is built
no black box
How this score is built
We don't rate products ourselves. We collect what each public rater already says, put every scale on common ground, and keep the disagreements visible instead of averaging them away.
- 1
Collect each rater's own score
Every source keeps its native verdict for this product. We never invent a score for an axis a source didn't measure.
- 2
Normalize to 0–100, higher = better
Raters can use different scales and directions: some where a low number means safe, some where a high one does. We map them all onto one 0–100 axis and flip the ones that run backwards so the numbers are finally comparable.
- 3
Average per axis, but keep the spread
Scores on the same axis become one representative number (their mean). When raters split by 20+ points we flag it and keep every rater's number. A disagreement is never blended into silence.
- 4
Your weights make the overall
The ring is the weighted average of the four pillars using your weights. It's computed fresh every time and never stored, so there's no hidden “objective” default.
worked example · Ingredient safety
- Health Canada Ingredient Hotlist85 on 0–10085
- Greenlens Ingredient Scan16 on 0–10016
- Greenlens Tolerance Screen64 on 0–10064
- Greenlens Precautionary Screen55 on 0–10055
- ANSES Endocrine Disruptors60 on 0–10060
Average of 85 · 16 · 64 · 55 · 60pillar36
Raters split here, so this 36 is a midpoint, not a consensus. The spread stays on the “every rater” list above.
Why the safety score
Greenlens Ingredient Scan
Independent · EU regulatory reference
16/100
Flagged 13 of 54 ingredients: 6 restricted, 1 of concern, 4 regulated allergens.
- Mentha Piperita OilEU Cosmetics Regulation Annex III / Reg. (EU) 2023/1545 (labelled fragrance allergen)−3
- CETRIMONIUM CHLORIDE (1) / STRARTRIMONIUM CHLORIDE (1)EU Cosmetics Regulation Annex III (restricted)−10
- PolyacrylamidesEU Cosmetics Regulation Annex III (restricted)−10
- LAURETH-9EU Cosmetics Regulation Annex III (restricted)−10
- LAURETH-9EU Cosmetics Regulation Annex III (restricted)−10
- LAURETH-9EU Cosmetics Regulation Annex III (restricted)−10
- POTASSIUM HYDROXIDE / SODIUM HYDROXIDEEU Cosmetics Regulation Annex III (restricted)−10
- BHT / BHACommon transparency/sensitization concern (not a regulatory ban)−12
- Benzyl AlcoholEU Cosmetics Regulation Annex III / Reg. (EU) 2023/1545 (labelled fragrance allergen)−3
- LimoneneEU Cosmetics Regulation Annex III / Reg. (EU) 2023/1545 (labelled fragrance allergen)−3
- LinaloolEU Cosmetics Regulation Annex III / Reg. (EU) 2023/1545 (labelled fragrance allergen)−3
Starts at 100; 43 other ingredients carried no recognized regulated hazard. Absence of a flag means no regulated hazard was recognized — not proof of safety. This is one lens; see where raters disagree above.
Why this score
Every ingredient, under all three lenses
The Scan is one opinion. The strict and lenient lenses read the same list and land 48 points apart. See what each one flags, and what it costs.
Weighted by what you care about
Tune your weights
composite recomputes live
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1.0×
1.0×
1.0×
Packagingno rating
No rater covers this axis for this product, so its weight can't move the score.
0 means ignored. Higher = more weight in your composite.
Ingredients, decoded
Data availability
Robust53 of 54 characterized
Our sources have reference data on 53 of 54 listed ingredients; 1 is uncharacterized in our data — a gap, not a clean bill.
| Ingredient | What it does | Safety | Data |
|---|---|---|---|
| Waterantiplaqueskin conditioningsolvent | antiplaqueskin conditioningsolvent | No flags in our sources | Well-characterized |
| Disodium Laureth Sulfosuccinatecleansingfoamingsurfactant - cleansing | cleansingfoamingsurfactant - cleansing | No flags in our sources | Well-characterized |
| Sodium Methyl Cocoyl Tauratesurfactant - cleansing | surfactant - cleansing | No flags in our sources | Well-characterized |
| Cocamide MEAemulsion stabilisingsurfactant - cleansingsurfactant - emulsifying | emulsion stabilisingsurfactant - cleansingsurfactant - emulsifying | No flags in our sources | CosIng-catalogued |
| Cocamidopropyl Hydroxysultaineantistaticcleansinghair conditioning | antistaticcleansinghair conditioning | No flags in our sources | Well-characterized |
| PEG-7 Glyceryl Cocoatesurfactant - cleansingsurfactant - emulsifying | surfactant - cleansingsurfactant - emulsifying | No flags in our sources | Well-characterized |
| Amodimethiconeantistatichair conditioning | antistatichair conditioning | No flags in our sources | CosIng-catalogued |
| Sodium Lauryl Sulfoacetatecleansingfoamingsurfactant - cleansing | cleansingfoamingsurfactant - cleansing | No flags in our sources | Well-characterized |
| Sodium Lauroyl Sarcosinateantistaticcleansingfoaming | antistaticcleansingfoaming | No flags in our sources | Well-characterized |
| Decyl Glucosidecleansingemulsion stabilisingsurfactant - cleansing | cleansingemulsion stabilisingsurfactant - cleansing | No flags in our sources | Well-characterized |
| Lauryl Glucosidecleansingsurfactant - cleansing | cleansingsurfactant - cleansing | No flags in our sources | Well-characterized |
| Glycerinperfuminghumectantdenaturant | perfuminghumectantdenaturant | No flags in our sources | Well-characterized |
| Coconut Oil Glycereth-8 Esterscleansingsurfactant - cleansing | cleansingsurfactant - cleansing | No flags in our sources | CosIng-catalogued |
| Dimethiconeemollientantifoamingskin conditioning | emollientantifoamingskin conditioning | No flags in our sources | Well-characterized |
| Shea Butter Glycereth-8 Esterscleansingsurfactant - cleansingsurfactant - emulsifying | cleansingsurfactant - cleansingsurfactant - emulsifying | No flags in our sources | CosIng-catalogued |
| Cocos Nucifera Waterfragrance | fragrance | No flags in our sources | Well-characterized |
| Citrus Grandis Peel Oilperfumingfragranceskin conditioning | perfumingfragranceskin conditioning | Examined, no flag | Referenced |
| Camellia Sinensis Leaf Extractuv absorberfragranceantimicrobial | uv absorberfragranceantimicrobial | No flags in our sources | Well-characterized |
| Macrocystis Pyrifera Extractskin conditioning | skin conditioning | No flags in our sources | CosIng-catalogued |
| Ocimum Basilicum Leaf Extractskin conditioning | skin conditioning | No flags in our sources | CosIng-catalogued |
| Cocos Nucifera Oilperfumingfragrancehair conditioning | perfumingfragrancehair conditioning | No flags in our sources | Well-characterized |
| Oryza Sativa Extractabrasiveabsorbenthair conditioning | abrasiveabsorbenthair conditioning | No flags in our sources | CosIng-catalogued |
| Hydrolyzed Lupine Proteinantistatichair conditioningskin conditioning | antistatichair conditioningskin conditioning | No flags in our sources | CosIng-catalogued |
| Oryza Sativa Seed Proteinantioxidant | antioxidant | No flags in our sources | CosIng-catalogued |
| Salvia Lavandulaefolia Leaf Oil | Not in our sources | No data | |
| Phytic Acidchelating | chelating | No flags in our sources | CosIng-catalogued |
| Creatineskin conditioning | skin conditioning | No flags in our sources | CosIng-catalogued |
| Mentha Piperita Oilperfumingfragrancerefreshing | perfumingfragrancerefreshing | EU-regulated fragrance allergen· flagged by 1 of 9raters disagree | Referenced |
| Panthenolantistatichair conditioningskin conditioning | antistatichair conditioningskin conditioning | No flags in our sources | Well-characterized |
| Citric Acidfragrancechelatingbuffering | fragrancechelatingbuffering | Health Canada Hotlist — restricted· flagged by 1 of 9raters disagree | Referenced |
| Ethylhexylglycerindeodorantskin conditioning | deodorantskin conditioning | No flags in our sources | Well-characterized |
| Glycol Distearateemollientopacifyingsurfactant - emulsifying | emollientopacifyingsurfactant - emulsifying | No flags in our sources | Well-characterized |
| Acrylates Copolymerfilm formingantistaticbinding | film formingantistaticbinding | EU microplastics-restricted· flagged by 1 of 9raters disagree | Referenced |
| Cetrimonium Chloridepreservativeantimicrobialantistatic | preservativeantimicrobialantistatic | EU-restricted (with limits)· flagged by 2 of 9raters disagree | Referenced |
| Polyquaternium-10film formingantistatic | film formingantistatic | No flags in our sources | CosIng-catalogued |
| Trideceth-12surfactant - cleansingsurfactant - emulsifying | surfactant - cleansingsurfactant - emulsifying | No flags in our sources | Well-characterized |
| Polyquaternium-7film formingantistatic | film formingantistatic | EU-restricted (with limits)· flagged by 2 of 9raters disagree | Referenced |
| C11-15 Pareth-7surfactant - cleansingsurfactant - emulsifying | surfactant - cleansingsurfactant - emulsifying | No flags in our sources | CosIng-catalogued |
| Laureth-23cleansingsurfactant - cleansingsurfactant - emulsifying | cleansingsurfactant - cleansingsurfactant - emulsifying | EU-restricted (with limits)· flagged by 2 of 9raters disagree | Well-characterized |
| PEG-150 Distearatesurfactant - cleansingsurfactant - emulsifyingviscosity controlling | surfactant - cleansingsurfactant - emulsifyingviscosity controlling | No flags in our sources | Well-characterized |
| Laureth-4fragranceantistaticsurfactant - cleansing | fragranceantistaticsurfactant - cleansing | EU-restricted (with limits)· flagged by 2 of 9raters disagree | Well-characterized |
| Sodium Phytatechelatingoral care | chelatingoral care | No flags in our sources | Well-characterized |
| Laureth-9surfactant - emulsifying | surfactant - emulsifying | EU-restricted (with limits)· flagged by 2 of 9raters disagree | Referenced |
| Dipropylene Glycolperfumingfragrancesolvent | perfumingfragrancesolvent | No flags in our sources | Well-characterized |
| Cystine Bis-PG-Propyl Silanetriolskin conditioning | skin conditioning | No flags in our sources | CosIng-catalogued |
| Sodium Hydroxidebufferingdenaturant | bufferingdenaturant | EU-restricted (with limits)· flagged by 2 of 9raters disagree | Referenced |
| BHTfragranceantioxidant | fragranceantioxidant | Endocrine-active· flagged by 3 of 9raters disagree | Referenced |
| Phenoxyethanolpreservativeantimicrobial | preservativeantimicrobial | Mild sensitizer for some· flagged by 1 of 9raters disagree | Referenced |
| Chlorphenesinpreservativeantimicrobial | preservativeantimicrobial | No flags in our sources | CosIng-catalogued |
| Potassium Sorbatepreservativefragrance | preservativefragrance | No flags in our sources | Well-characterized |
| Sodium Benzoatepreservativefragranceanticorrosive | preservativefragranceanticorrosive | No flags in our sources | Well-characterized |
| Benzyl Alcoholpreservativeperfumingsolvent | preservativeperfumingsolvent | EU harmonised skin sensitizer· flagged by 2 of 9raters disagree | Referenced |
| Limoneneperfumingdeodorantsolvent | perfumingdeodorantsolvent | ANSES endocrine candidate· flagged by 3 of 9raters disagree | Referenced |
| Linaloolperfumingdeodorant | perfumingdeodorant | EU harmonised skin sensitizer· flagged by 2 of 9raters disagree | Referenced |
Where this came from
Cruelty-free status recorded from crueltyfree.peta.org ↗
Researched facts on Greenlens always carry the page that stated them — nothing is inferred from a model's memory.