Yuka assigns a score out of 100 to shampoos by analyzing their ingredient lists. The app highlights components deemed risky (certain sulfates, silicones, controversial preservatives) and values short formulas that are predominantly natural or organic. This rating system helps to eliminate products that are heavily loaded with debated substances, but it says nothing about the actual performance of the shampoo or its suitability for a specific hair type.
What the Yuka score evaluates in a shampoo (and what it ignores)
The score is based on the presence or absence of ingredients listed in toxicological databases. A shampoo without silicone, without harsh sulfate, and without suspected endocrine disruptors will receive a high score, even the maximum score.
On the other hand, Yuka does not measure hair efficacy or compatibility with the scalp. A product rated 100/100 can very well dry out curly hair or make fine roots greasy. Test Achats’ analysis of sunscreens showed that a well-rated product on Yuka could prove insufficient in actual protection, illustrating this disconnect between score and performance.
La Canopée, a care brand, also criticizes the fact that Yuka simplifies complex scientific topics into a binary score, without considering doses, ingredient synergies, or individual needs. A mild surfactant at low concentration does not have the same effect as a harsh sulfate at the top of the formula, but the score does not always make this distinction.
In other words, the Yuka score serves as a useful filter to eliminate the most questionable formulas. It does not replace careful reading of the composition or testing on your own hair. Finding the best shampoo rated on Yuka therefore involves cross-referencing this score with other criteria.
Ingredients flagged by Yuka: sulfates, silicones, and preservatives to decode
Three families of components concentrate the app’s attention. Understanding their role allows for an informed choice rather than fleeing from any ingredient with a suspicious name.
Sulfates and cleansing agents
The sodium lauryl sulfate (SLS) is the surfactant most often pointed out. It lathers abundantly but can irritate sensitive or reactive scalps. Well-rated shampoos generally replace it with gentler surfactants (coco-glucoside, sodium cocoyl glutamate), which clean without stripping the hydrolipidic film.
For oily hair, a mild sulfate in low proportion is not necessarily problematic. The context of use is as important as the molecule itself.
Silicones and conditioning agents
Silicones (dimethicone, cyclopentasiloxane) smooth the fiber and facilitate detangling. Yuka penalizes them because they are suspected of suffocating the hair over the long term and are not very biodegradable. A silicone-free shampoo may seem less silky in the first few weeks, while the hair regains its natural texture.
Controversial preservatives
Some parabens and phenoxyethanol lower the score. Alternatives (sorbic acid, benzyl alcohol, natural origin preservatives) are found in most well-ranked formulas. A certified organic shampoo automatically excludes the most debated preservatives.
Adapting the choice of a Yuka shampoo to your hair type
A high score guarantees a cleaner composition, not a universal hair result. The hair type remains the determining criterion.
- Dry or curly hair: prioritize a formula enriched with vegetable oil (argan, sweet almond, coconut) and aloe vera. Mild sulfate-free cleansing bases better preserve natural hydration.
- Oily hair: a gentle shampoo based on clay or nettle, even well-rated, must retain a minimum cleansing power. Check that the formula is not too rich in oils, which Yuka does not indicate.
- Sensitive scalp or dandruff-prone: look for soothing actives (bisabolol, thermal water, calendula). A dermo-protective shampoo rated 90+ on Yuka and formulated by a dermatological laboratory may be more suitable than a 100/100 product designed for normal hair.
- Colored hair: the absence of harsh sulfates, valued by Yuka, is a real asset here since sulfates accelerate the washing out of pigments.
Completing Yuka with other verification tools
Yuka is not the only cosmetic analysis app. INCI Beauty and QuelCosmetic from UFC-Que Choisir use different methodologies, and the scores can diverge for the same product. INCI Beauty, for example, weighs the concentration of ingredients more and displays a molecule-by-molecule detail.
Cross-referencing two apps allows you to spot shampoos that receive good scores across multiple analysis grids, which enhances the reliability of the choice. A product well-ranked on Yuka and on QuelCosmetic is more likely to be truly clean than a product evaluated on only one reference framework.
The mention certified organic (Ecocert, Cosmos Organic) remains a complementary benchmark. It imposes specifications on the origin of ingredients, manufacturing processes, and the absence of certain substances, which the Yuka score alone does not fully cover.
Solid shampoo and Yuka score: format and composition often go hand in hand
Solid shampoos frequently rank among the highest-rated on Yuka. Their concentrated formula contains less water, thus fewer preservatives, which mechanically reduces the number of potentially penalized ingredients.
This format is not suitable for all uses. On long and thick hair, rinsing may take longer. On very dry scalps, some solid surfactants (sodium coco-sulfate) remain stripping despite a good overall score. The solid format is not synonymous with gentleness for all hair profiles.
Reading the INCI list of solid shampoo with the same attention as that of a liquid remains the best approach. The Yuka score confirms the absence of flagged components; the rest depends on the texture, fragrance, and especially the reaction of your hair after two to three weeks of regular use.