Long4Lashes fait partie des sérums pour cils les plus connus. Ce qu’il contient, pourquoi il agit, ce que vous acceptez en l’utilisant – et pour qui nous recommandons une alternative.
ARBUTI Hair Salon · Mis à jour octobre 2026
Fiche produit
Produit
Long4Lashes sérum pour cils (formule FX5), applicateur pinceau comme un eye-liner
Actif
Un analogue de prostaglandine – le bimatoprost selon la liste d’ingrédients de la boutique du fabricant, l’isopropyl cloprostenate dans d’anciennes fiches de revendeurs
Application
Selon le fabricant, une fois par jour, le soir, sur la ligne des cils supérieurs démaquillée
Où l’acheter
En ligne et en magasin ; la disponibilité varie. Le fabricant propose désormais aussi un « Day & Night Double Serum » qui, d’après sa liste d’ingrédients, ne contient pas d’analogues de prostaglandine.
Pour qui
Les adultes aux cils courts ou fragiles qui connaissent et acceptent les mises en garde sur les effets indésirables
À éviter
Pendant la grossesse et l’allaitement, en cas de maladie des yeux, après une opération des yeux ou sous traitement contre le glaucome – demandez d’abord l’avis d’un médecin
Comment agit Long4Lashes
Les analogues de prostaglandine ont d’abord été utilisés en collyre contre l’hypertension oculaire. On a alors remarqué que les patients et patientes obtenaient des cils plus longs et plus denses. Les sérums cosmétiques pour cils exploitent cet effet : ils prolongent la phase de croissance des cils. C’est pourquoi les sérums contenant ces substances passent pour les plus efficaces – et c’est aussi pourquoi ils sont vus d’un œil critique.
Le Comité scientifique européen pour la sécurité des consommateurs (SCCS) a jugé, dans son avis définitif de février 2026, plusieurs analogues de prostaglandine non sûrs dans les sérums pour cils et sourcils, dont l’isopropyl cloprostenate. Aucune restriction légale n’a encore été adoptée (octobre 2026). En France, l’ANSES met en garde contre de possibles changements de couleur des yeux.
Effets secondaires possibles
Rougeurs, brûlures ou démangeaisons de la paupière et de l’œil
Coloration plus foncée de la peau des paupières
Dans de rares cas, un changement de couleur de l’iris, surtout chez les yeux clairs ou de couleur mixte
Pousse de petits poils là où le sérum touche la peau
En cas de gêne, arrêtez le sérum et consultez un ophtalmologue si les symptômes persistent. Si vous utilisez un collyre contre le glaucome, n’utilisez de sérum aux prostaglandines qu’après avis médical.
Long4Lashes et notre alternative
1
Notre choix sans prostaglandine
Lazru sérum cils et sourcils
Un sérum pour cils et sourcils sans prostaglandines ni hormones – d’après la liste d’ingrédients publiée, avec les actifs Procapil™ et AnaGain™ et de la caféine. Dermatest a jugé la tolérance cutanée « très bonne » (06/2022). Le fabricant annonce de premiers changements au bout de quelques semaines, plus nets après deux à quatre mois – variable d’une personne à l’autre.
Les points forts
Sans analogues de prostaglandine ni hormones
Pour cils et sourcils
Dermatest « très bon » (tolérance cutanée)
À savoir
Demande de la patience : au moins deux mois d’utilisation
Un sérum connu contenant un analogue de prostaglandine. Cette classe d’actifs stimule de façon prouvée la pousse des cils. En contrepartie, vous devez connaître les effets indésirables possibles et appliquer le sérum soigneusement, uniquement sur la ligne des cils.
Les points forts
Classe d’actifs à l’effet prouvé sur la pousse des cils
Pinceau précis
Application simple
À savoir
Contient un analogue de prostaglandine
Coloration des paupières et irritation des yeux possibles
Tous les sérums pour cils, avec et sans prostaglandines, figurent dans notre sélection de sérums pour cils. RevitaLash fonctionne lui aussi avec un actif de type prostaglandine.
Questions fréquentes
Long4Lashes contient-il des hormones ?
Pas au sens des hormones sexuelles. Mais il contient un analogue de prostaglandine, c’est-à-dire un dérivé des prostaglandines – des messagers proches des hormones tissulaires. D’où le fait qu’on parle souvent d’« hormones ».
Long4Lashes est-il efficace ?
Les analogues de prostaglandine font partie des actifs à l’effet le plus net sur la pousse des cils. L’ampleur et la rapidité varient d’une personne à l’autre.
Quels sont les effets secondaires de Long4Lashes ?
Sont possibles des yeux irrités et rouges, une peau des paupières plus foncée et, rarement, un changement de couleur des yeux. En cas de gêne, arrêtez et consultez un médecin.
Existe-t-il une alternative sans prostaglandines ?
Oui. Notre recommandation est Lazru, un sérum pour cils et sourcils sans prostaglandines ni hormones. Plus de détails dans notre comparatif des sérums pour cils.
Peut-on utiliser Long4Lashes pendant la grossesse ?
Non, nous le déconseillons. Parlez-en à votre médecin ou à votre sage-femme.
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