Tested on hair-length, very thick and very flexible. A first very inconclusive test: too much product apparently (5 pressures) applied to wet hair. Result: difficult drying (hair sticking together) and very ugly outcome, effect "cardboard", dull hair ... well, not again! The following tests are very mixed. Overall, the dosage is too delicate. With a very thick and very soft hair, anti-frizz effect is almost zero if the dose is not consistent; but I have seen the effects of a dose "more consistent" precisely ... So now I use it only in the morning, and sparingly on dry hair, and exclusively on the tips because it also has a restorative function for dry and damaged ends. In this use the product seems quite effective and nourishes the hair, the tips are less brittle. I do not recommend it, especially since the price is not attractive. I much prefer him to cost almost equal, L'Oreal Elvive Liss intense anti-frizz serum, for its efficiency and ease of use.