Nº.4CURL Bond Shaper Hydrating Curl Shampoo safety rating

Nº.4CURL Bond Shaper Hydrating Curl Shampoo safety rating | Greenlens

Raters split

Ingredient safety

A 25-point gap between the two loudest voices.

60Greenlens Precautionary ScreenIndependent

85Health Canada Ingredient HotlistGovernment

050100

See why, ingredient by ingredient

All 1440 cleaner options, safest first We show the best 12, including the strongest on each axis.

Every rater, every axis

Ingredient safety

25 pts apart

Independent — not funded by the brands it rates. Auto-linked to this product, not yet human-reviewed. Checked this week. about this rater →
Independent — not funded by the brands it rates. Auto-linked to this product, not yet human-reviewed. Checked this week. about this rater →
A government authority. Auto-linked to this product, not yet human-reviewed. Checked this week. about this rater →
Independent — not funded by the brands it rates. Auto-linked to this product, not yet human-reviewed. Checked this week. about this rater →
A government authority. Auto-linked to this product, not yet human-reviewed. Checked this week. about this rater →

Also screened, nothing found: ECHA SVHC Candidate List · California Proposition 65 · IARC Monographs · US NTP Report on Carcinogens · EU Harmonised Classification (CLP Annex VI)

Recognized on a safer-ingredients list: US EPA Safer Choice recognizes 55% of ingredients as safer choices — a marker, never a score.

Environmental

A government authority. Auto-linked to this product, not yet human-reviewed. Checked this week. about this rater →

Labor

Run by a nonprofit. Auto-linked to this product, not yet human-reviewed. This rates Olaplex as a company and applies to everything they make, not this product alone. Checked this week. about this rater →

Packaging

Independent — not funded by the brands it rates. Auto-linked to this product, not yet human-reviewed. Checked this week. We started showing this score on Sep 11, 2026. about this rater →

Coverage & match quality

8 ratings · 4 of 4 axes

Some ratings rest on an automatic match that has not been human-reviewed.

Weighted by what you care about

Tune your weights

composite recomputes live

Ingredient safety1.0×

Environmental1.0×

Labor1.0×

Packaging1.0×

0 means ignored. Higher = more weight in your composite.

What we know about the packaging

Unidentified0 of 1 identified

Nobody recorded what this pack is actually made of beyond “plastic”, so the packaging score is a stand-in for the middle of that range — not a reading of this container.

Recorded only as “plastic” — no resin code. It could be PET (#1) (widely recyclable) or PVC (#3) (hard to recycle); nothing on record says which, so it counts as 46 out of 100, the middle of that range.

This says how precisely the packaging is described, not how good it is — a fully identified material can still be a bad one.

How we know the packaging

Read from the product photo, not declared by the maker — treat this score as weaker.

The container looks like this, rather than the maker saying so. A photo also cannot show the resin code moulded into the base, so every plastic container reads as “plastic, unspecified” — the cautious end of the plastics range, not a finding about this particular pack.

Ingredients, decoded

Data availability

Robust47 of 49 characterized

Our sources have reference data on 47 of 49 listed ingredients; 2 are uncharacterized in our data — a gap, not a clean bill.

Worth a look (8)

Cocamidopropyl Betainecommon irritantantistatic · cleansing · hair conditioningraters disagree
Strong contact sensitizerflagged by 1 of 9 lists →
Phenethyl Alcoholfragrance materialfragranceraters disagree
ANSES endocrine candidateflagged by 1 of 9 lists →
Acrylates Copolymerfilm forming · antistatic · bindingraters disagree
EU microplastics-restrictedflagged by 1 of 9 lists →
Polyquaternium-7film forming · antistaticraters disagree
EU-restricted (with limits)flagged by 2 of 9 lists →
Mentholfragrance materialfragrance · denaturant · refreshingraters disagree
EU-regulated fragrance allergenflagged by 1 of 9 lists →
Lactic Acidexfoliating acidhumectant · buffering · skin conditioningraters disagree
Health Canada Hotlist — restrictedflagged by 1 of 9 lists →
Acrylamidopropyltrimonium Chloride/Acrylamide Copolymerfilm forming · antistatic · hair fixingraters disagree
EU-restricted (with limits)flagged by 2 of 9 lists →
Sodium Metabisulfitepreservative · antioxidant · reducingraters disagree
EU-restricted (with limits)flagged by 2 of 9 lists →

No flags in our sources (39)

No data in our sources (2)

Not a verdict — our authorities simply have no reference for these.

What these ingredient tags mean (5)

These describe what an ingredient is, not whether it is a problem. The stance marks above are the ratings; these are not.

common irritantCocamidopropyl Betaine, Propylene Glycol
- Cocamidopropyl Betaine: A mild cleansing agent, but a recurring patch-test finding, usually traced to leftovers from how it is made. American Contact Dermatitis Society, Allergen of the Year 2004 (Fowler JF Jr, Dermatitis 2004;15(1):3-4).
- Propylene Glycol: A solvent that shows up in patch-test clinics, more often as irritation than as allergy. American Contact Dermatitis Society, Allergen of the Year 2018 (Jacob SE, Scheman A, McGowan MA, Dermatitis 2018;29(1):3-5).
fragrance materialMenthol
- Menthol: The cooling component of mint oils, named by the EU as a fragrance substance to be declared on the label. EU Regulation (EC) 1223/2009, Annex III entry 338, inserted by Commission Regulation (EU) 2023/1545: a fragrance substance whose presence must be indicated in the list of ingredients above 0,001% in leave-on and 0,01% in rinse-off products. It is declarable in its OWN right, not by way of any component it carries. The name to look for on a label is "Menthol". The duty applies now. Transition footnote (40) lets stock that does not comply, lawfully placed on the Union market before the 31 July 2026 cut-off, be made available until 31 July 2028.
exfoliating acidLactic Acid
- Lactic Acid: An alpha hydroxy acid that loosens surface skin cells; it also makes skin more sun-sensitive while you use it. FDA, "Guidance for Industry: Labeling for Topically Applied Cosmetic Products Containing Alpha Hydroxy Acids as Ingredients" (announced at 70 FR 1721, 10 January 2005; FDA web pages title it "Labeling for Cosmetics Containing Alpha Hydroxy Acids"), which names this acid and recommends the statement "Sunburn Alert: This product contains an alpha hydroxy acid (AHA) that may increase your skin's sensitivity to the sun and particularly the possibility of sunburn."