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Solid shampoos: effective or not?

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Endocrine disruptors, irritants and allergens can creep in in our hair products. While the former can have a harmful effect on hormones and reproductive organs, the latter weaken the scalp and cause irritation and itching. To avoid them, no choice but good peel the labels or to opt for eco-labelled shampoos. Among them, solid shampoos are arousing more and more enthusiasm among consumers, because they are presented as more “eco-friendly” (they contain no or very little water), safer and more natural. But are these as effective as traditional products? Formulations are they really greener and just as safe for your health?

This is the question asked by 60 million consumers, published by the National Consumer Institute, who wanted to study the composition 10 solid shampoos through laboratory analyses. The organization also had them tested by around twenty panelists for 30 days, to judge their effectiveness and practicality. On the label side, its experts indicate that the formulation is rather healthy overall since all solid products tested (also toothpastes and deodorants) have, with a few exceptions, a Cosmeto’Score A or B. Like the Ménag’Score for household products, the Cosmeto’Score is a rating system independent of industrial lobbies which evaluates the impact of products for health and the environment.

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What verdict after several weeks of use?

However, 60 million consumers estimate that certain products analyzed “are penalized by a cumulative effect: they contain several molecules in irritating or sensitizing power, or harmful to the environment. This does not mean that they are dangerous, only that there are some risks and that their formulation could be improved. But if there is indeed an area where solid cosmeticshave more recommendable than the traditional ones is the packaging. Indeed, the absence of water makes it possible to do without plastic and to use cardboard: only two products out of 27 tested have plastic packaging. And it is for bar shampoos that “the gain in volume is the greatest compared to conventional shampoos, where water represents 70% of the volume on average. »

An important advantage since the carbon footprint transport of these products is therefore optimised. In the form of pebbles or bread, the solid shampoos analyzed contain a smaller number of ingredients compared to their traditional counterparts, with a little water sometimes conservatives although in smaller quantities. Other advantages: “they are, in general, without silicone or sulphates, and all made in France with the exception of two of the products in our selection. adds 60 million consumers. But what about their effectiveness? Ease of rinsing, effects on the hair, foam formation… This is actually their weak point, say its experts. Because the ten references tested were judged “correct” on this point by the twenty panelists recruited for the occasion.

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But it turns out that after a month of testing, “the latter often prefer their conventional shampoo usual. While many blogs advise users to be patient about how to use them and to get the hair used to them, the reason really lies in the formulation. Because the ingredients being less diluted, the shampoo is more concentrated. However, “if it is misused, it can irritate the scalp, for example. “, warns 60 million consumers. This is why its conclusions invite to avoid those which contain essential oils and recall that even certain ranges solid shampoo may also be advised against children and pregnant or breastfeeding women. As usual, it is therefore better to be vigilant to the warnings displayed on the packaging.

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