Keratin Smooth Conditioner With Keratin & Argan Oil by Tresemmé — product pack

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Tresemmé

Keratin Smooth Conditioner With Keratin & Argan Oil

haircare
3.5 Concerning

Decode Label Safety Score

Ingredient safety · 55% 4.6/10
Processing · 15% 7.0/10
Marketing · 30% 7.9/10
How we got 3.5 Show
Weighted score 6.0/10
Capped — Contains an isothiazolinone contact sensitizer — MCI/MI (EU SCCS) ≤ 3.5
Also flagged
High load of declared fragrance allergens (EU-listed)
Final score 3.5/10 · Concerning

Methodology v3.1 (updated 8 Oct 2026) — what changed

The score is capped for a specific safety reason, set out below. This rinse-off conditioner contains Methylchloroisothiazolinone and Methylisothiazolinone (MCI/MI), potent contact sensitizers restricted in leave-on products by the EU. While permitted in rinse-off cosmetics at controlled concentrations, these preservatives are a primary concern for individuals with sensitive skin or a history of contact allergies. The product also includes 'Fragrance' and several declared fragrance allergens, which are common sensitizers for those with fragrance sensitivities. Despite these concerns, the formulation includes beneficial conditioning agents like Cetearyl Alcohol, Dimethicone, and Argan Oil, which contribute to hair conditioning and smoothness. However, the presence of MCI/MI and the high load of fragrance allergens are the main factors limiting its suitability for a broader audience.

Contains potent sensitizing preservatives and multiple fragrance allergens

The score is capped for a specific safety reason, set out below. This conditioner contains Methylchloroisothiazolinone and Methylisothiazolinone (MCI/MI), preservatives known to be potent contact sensitizers, which are restricted in leave-on products by the EU. It also includes 'Fragrance' and several declared fragrance allergens, which can cause reactions in individuals with sensitive skin or fragrance allergies. While it offers conditioning benefits, those with skin sensitivities should exercise caution.

Consider this product carefully if you are

  • Avoiding certain additives or colours — Methylchloroisothiazolinone is declared.
Okay for: Individuals without known skin sensitivities or allergies

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  • Ingredients you avoid. Sulphates, parabens, silicones, fragrance, drying alcohol, PEGs and more.
  • Sensitivities. Sensitive skin, hormonal considerations, pregnancy.
  • Skin and hair goals. Acne, dryness, ageing, hair fall, dandruff: what the label declares for each.
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Concern breakdown What drives the score, concern by concern · score out of 10, higher = fewer concerns
Key risks: Contains an isothiazolinone contact sensitizer — MCI/MI (EU SCCS) Methylchloroisothiazolinone Linalool PEG-7 Propylheptyl Ether Fragrance

Concern breakdown

Score out of 10 · higher = fewer concerns

How this product performs on each concern we check for haircare. This is a breakdown of the same evidence behind the score above — not a separate verdict.

Preservative Safety Significant concern · 2.0/10
Fragrance & Allergen Load Significant concern · 3.0/10
Harsh Surfactants & Irritants No concern identified · 8.0/10
Irritant & Sensitising Actives No concern identified · 8.0/10
Endocrine-Active Ingredients No concern identified · 8.0/10
Carcinogen & Contaminant Risk No concern identified · 8.0/10
Label Transparency No concern identified · 8.0/10

Why the score is capped

Contains an isothiazolinone contact sensitizer — MCI/MI (EU SCCS)

Rule PC-CAP-15

High load of declared fragrance allergens (EU-listed)

Rule PC-CAP-03

What's good

Contains multiple effective conditioning agents (Cetearyl Alcohol, Dimethicone, Amodimethicone, Cetrimonium Chloride, Behentrimonium Chloride, Stearamidopropyl Dimethylamine) for hair smoothness and detangling.

Includes Hydrolyzed Keratin to help strengthen hair.

Contains Argania Spinosa Kernel (Argan) Oil, a nourishing plant oil for hair conditioning.

Watch out for

The presence of Methylchloroisothiazolinone and Methylisothiazolinone (MCI/MI) poses a significant risk of contact sensitization, especially for individuals with sensitive skin or a history of allergies.

The undisclosed 'Fragrance' blend, combined with several declared fragrance allergens, increases the likelihood of allergic reactions for those with fragrance sensitivities.

Silicones like Dimethicone and Amodimethicone, while beneficial for conditioning, can lead to product build-up on hair over time, potentially requiring clarifying shampoos.

Disodium EDTA — disodium EDTA is a chelating agent that keeps a product stable and clear. It has been flagged in some studies for potential endocrine-disrupting properties; regulatory consensus is not yet established, so it is noted as a low-level concern rather than a confirmed hazard.

Ingredient Concerns safety database

Sources cited below may be Indian (FSSAI) or international (EU, US, WHO, IARC) — an international classification or law is evidence, not an Indian regulatory finding.

Methylisothiazolinone

MI and its chlorinated partner MCI are preservatives and recognised contact sensitisers. After MI replaced parabens in many products, European dermatology clinics recorded a sharp rise in contact allergy to it. Contact allergy, once acquired, is usually long-lasting, so people already sensitised to MI are advised to avoid it. EU rules ban MI from leave-on cosmetics (since 2017) and limit it to 15 ppm in rinse-off products. Whether a particular product causes a reaction depends on the person, the concentration and the contact time, which the label alone cannot show.

Regulatory & scientific authority Source: EU Regulation 2017/1224; SCCS Opinion SCCS/1521/13; British Journal of Dermatology (MI epidemic)

Methylisothiazolinone: regulation, sources and other products →

Fragrance Allergens (EU-listed)

These are individual fragrance components that are known contact allergens. EU rules require them to be named on the label when present above 0.001% (leave-on) or 0.01% (rinse-off), because "parfum" alone would hide them. Limonene and linalool are especially common and become more allergenic as they oxidise on exposure to air. This is a risk for people who are sensitised, not a general-population hazard.

Regulatory & scientific authority Source: EU Regulation 2023/1545 (extended fragrance-allergen labelling); SCCS opinions on fragrance allergens

Fragrance Allergens (EU-listed): regulation, sources and other products →

Fragrance

"Fragrance" or "parfum" is a catch-all term that can conceal a blend of hundreds of undisclosed chemicals, including known allergens, sensitisers, and potential endocrine disruptors. The EU now mandates disclosure of 82 specific fragrance allergens. People with fragrance sensitivity, asthma, or contact dermatitis should prefer fragrance-free products.

Regulatory & scientific authority Source: EU Regulation 2023/1545; IFRA

Fragrance: regulation, sources and other products →

Polyethylene Glycols (PEGs)

PEG ingredients are made by ethoxylation, which can leave traces of ethylene oxide (IARC Group 1) and 1,4-dioxane (IARC Group 2B) unless removed. Good manufacturing removes them, so the ingredient itself is not a hazard, but the label cannot tell you whether it was done well. PEGs should not be applied to broken skin.

Regulatory & scientific authority Source: IARC Monographs Vol. 100F (ethylene oxide) and Vol. 71 (1,4-dioxane); Cosmetic Ingredient Review

Polyethylene Glycols (PEGs): regulation, sources and other products →

Decode Label Analysis

Contains Methylchloroisothiazolinone and Methylisothiazolinone (MCI/MI), potent contact sensitizers restricted in EU rinse-off cosmetics and prohibited in leave-on products (EU Reg. 2016/1198).

Contains 'Fragrance' and multiple declared fragrance allergens (Linalool, Benzyl Salicylate, Citronellol, Alpha-Isomethyl Ionone, Hexyl Cinnamal), which are common sensitizers for individuals with fragrance allergies (EU Reg. 1223/2009 Art. 19 + Annex III).

Contains PEG-7 Propylheptyl Ether, an ethoxylated ingredient that may carry a 1,4-dioxane residue, classified by IARC as Group 2B (possibly carcinogenic to humans). The EU SCCS considers 1,4-dioxane at or below 10 ppm in a finished cosmetic safe.

Combined Effects interactions

Methylchloroisothiazolinone Methylisothiazolinone

These two preservatives are often used in combination (MCI/MI blend) and are known for their synergistic antimicrobial activity but also their combined high sensitization potential. The EU SCCS has extensively reviewed their safety, leading to restrictions in rinse-off products and prohibition in leave-on products due to their potent contact sensitizing properties.

Fragrance Linalool Benzyl Salicylate Citronellol ALPHA-ISOMETHYL IONONE Hexyl Cinnamal

The presence of an undisclosed 'Fragrance' blend alongside multiple individually declared fragrance allergens increases the overall potential for allergic reactions in sensitive individuals. While the declared allergens are listed in trace amounts, the cumulative exposure from the 'Fragrance' blend and these specific compounds can trigger contact dermatitis or other allergic responses.

Claim check

Front-of-pack marketing claims checked against this product's actual ingredients and nutrition. "Can't verify" means the label does not provide enough information to check the claim — it is not the same as the claim being false.

?
"USED BY PROFESSIONALS" Can't verify

This claim refers to professional endorsement, which cannot be verified from the ingredient list or other label information provided.

?
"Up to 100% smoother shiny hair" Can't verify

This claim refers to a performance benefit that cannot be verified from the ingredient list or other label information provided.

✓
"KERATIN SMOOTH" Checks out

Hydrolyzed Keratin is listed in the ingredients, supporting the claim of containing keratin for smoothness.

HYDROLYZED KERATIN
✓
"WITH KERATIN & ARGAN OIL" Checks out

Hydrolyzed Keratin and Argania Spinosa Kernel (Argan) Oil are both listed in the ingredients.

HYDROLYZED KERATIN ARGANIA SPINOSA KERNEL (ARGAN) OIL

Read straight from the back-of-pack photo — quantities, sections and any disguised terms, so the small print can’t hide behind the marketing.

  • 1.
    Water
    WATER
  • 2.
    Cetearyl Alcohol
    CETEARYL ALCOHOL
  • 3.
    Dimethicone
    DIMETHICONE
  • 4.
    Amodimethicone
    AMODIMETHICONE
  • 5.
    PEG-7 Propylheptyl Ether
    PEG-7 PROPYLHEPTYL ETHER
  • 6.
    Cetrimonium Chloride
    CETRIMONIUM CHLORIDE
  • 7.
    Behentrimonium Chloride
    BEHENTRIMONIUM CHLORIDE
  • 8.
    Fragrance undisclosed fragrance
    PERFUME
  • 9.
    Stearamidopropyl Dimethylamine
    STEARAMIDOPROPYL DIMETHYLAMINE
  • 10.
    Sodium Chloride
    SODIUM CHLORIDE
  • 11.
    Lactic Acid
    LACTIC ACID
  • 12.
    Disodium EDTA
    DISODIUM EDTA
  • 13.
    Hydrolyzed Keratin
    HYDROLYZED KERATIN
  • 14.
    Argania Spinosa Kernel (Argan) Oil
    ARGANIA SPINOSA KERNEL (ARGAN) OIL
  • 15.
    Methylchloroisothiazolinone
    METHYLCHLOROISOTHIAZOLINONE
  • 16.
    Methylisothiazolinone
    METHYLISOTHIAZOLINONE
  • 17.
    Linalool
    LINALOOL
  • 18.
    Benzyl Salicylate
    BENZYL SALICYLATE
  • 19.
    Citronellol
    CITRONELLOL
  • 20.
    Alpha-Isomethyl Ionone
    ALPHA-ISOMETHYL IONONE
  • 21.
    Hexyl Cinnamal
    HEXYL CINNAMAL

In label order — normally largest quantity first. Select a row for the full write-up and sources.

Fragrance allergens are substances EU cosmetics rules require to be named on the label (such as Limonene and Linalool). Fragrant botanicals such as essential oils are grouped with them because they can naturally contain such substances, but they are not on that list. They matter mainly for people with fragrance allergies or already-sensitive skin — not a general-population safety issue. Each named allergen takes a small deduction from the ingredient score, and a high count can cap it; fragrant botanicals take none. Naming them on the label is a transparency positive.

Compare with other conditioner products

Assessed using the same Decode Label methodology, sorted by score. Each score reflects the information available for that product at the time of assessment.

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What are the ingredients in Keratin Smooth Conditioner With Keratin & Argan Oil?

The label of Keratin Smooth Conditioner With Keratin & Argan Oil lists 21 ingredients, in label order: Water, CETEARYL ALCOHOL, Dimethicone, Amodimethicone, PEG-7 Propylheptyl Ether, Cetrimonium Chloride, Behentrimonium Chloride, Fragrance, Stearamidopropyl Dimethylamine, Sodium Chloride, Lactic Acid, Disodium EDTA, Hydrolyzed Keratin, Argania Spinosa Kernel (Argan) Oil, Methylchloroisothiazolinone, Methylisothiazolinone, Linalool, Benzyl Salicylate, Citronellol, ALPHA-ISOMETHYL IONONE, Hexyl Cinnamal. Flagged by the analysis: Methylchloroisothiazolinone, Methylisothiazolinone, Fragrance, PEG-7 Propylheptyl Ether, Disodium EDTA.

Is Keratin Smooth Conditioner With Keratin & Argan Oil safe to use?

Keratin Smooth Conditioner With Keratin & Argan Oil scores 3.5/10 on Decode Label (Concerning). The score is capped for a specific safety reason, set out below. This conditioner contains Methylchloroisothiazolinone and Methylisothiazolinone (MCI/MI), preservatives known to be potent contact sensitizers, which are restricted in leave-on products by the EU. It also includes 'Fragrance' and several declared fragrance allergens, which can cause reactions in individuals with sensitive skin or fragrance allergies. While it offers conditioning benefits, those with skin sensitivities should exercise caution.

Why does Keratin Smooth Conditioner With Keratin & Argan Oil score 3.5/10?

Flagged in the score: The presence of Methylchloroisothiazolinone and Methylisothiazolinone (MCI/MI) poses a significant risk of contact sensitization, especially for individuals with sensitive skin or a history of allergies. The undisclosed 'Fragrance' blend, combined with several declared fragrance allergens, increases the likelihood of allergic reactions for those with fragrance sensitivities. Also noted: Silicones like Dimethicone and Amodimethicone, while beneficial for conditioning, can lead to product build-up on hair over time, potentially requiring clarifying shampoos.

Who should avoid Keratin Smooth Conditioner With Keratin & Argan Oil?

The points the analysis notes are most relevant to: Sensitive skin or contact allergies; Avoiding isothiazolinone preservatives; Fragrance allergy or sensitivity.

Does Keratin Smooth Conditioner With Keratin & Argan Oil contain allergens?

Yes — the label lists 5 fragrance allergens: Linalool, Benzyl Salicylate, Citronellol, ALPHA-ISOMETHYL IONONE and Hexyl Cinnamal. These matter mainly if you have sensitive skin or a known fragrance allergy.

Does Keratin Smooth Conditioner With Keratin & Argan Oil contain fragrance?

Yes — the ingredient list includes Fragrance. Fragrance is declared as a single ingredient, so the individual scent chemicals in it are not named; the label does separately list 5 fragrance allergens (Linalool, Benzyl Salicylate, Citronellol, ALPHA-ISOMETHYL IONONE and Hexyl Cinnamal). This matters mainly if you have sensitive skin or a known fragrance allergy.

Are the claims on the Keratin Smooth Conditioner With Keratin & Argan Oil pack accurate?

Decode Label checked 4 claims against the ingredient list and nutrition panel. "USED BY PROFESSIONALS" — can't be verified from the label. "Up to 100% smoother shiny hair" — can't be verified from the label.

Answers are generated from this product's own Decode Label analysis — the score, the ingredient list and the label claims shown above. Always check the pack itself for allergen and dietary information.

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About this analysis: Based on declared label information and available evidence. Decode Label does not independently laboratory-test products, and a score is not a regulatory determination or medical advice.

Disclaimer: Safety scores are Decode Label-generated assessments based on publicly available regulatory data (FSSAI, WHO, EFSA, IARC) and peer-reviewed research. They are not a substitute for professional medical advice, and they are not a regulatory determination, a laboratory safety certification or a medical diagnosis. Ingredient safety can vary by individual health conditions, concentration, and usage context. Decode Label is an independent information service and scores every brand by the same rules. No brand pays for or influences its score. Our founder also founded the personal-care brand Botani Bestie (see our story); its products are scored exactly like everyone else's. Data limitations: This assessment is based on the information declared on the product label and the evidence sources above — Decode Label does not independently laboratory-test this product. Ingredient concentrations, sourcing and manufacturing can vary between batches and are not always disclosed. A finding that is not shown here means it was not identified from the available label information, not that it has been ruled out.

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