It's called "Kérastase Specifique cure intensive anti-chute pro-ciblée à l'Aminexil GL M".
Oh, and I managed to find it in a US website! It's this one: Cure Anti-Chute Pro-Ciblée, hair loss treatment - Spécifique Kérastase
I see that there are various similar treatments - the one I linked above it's the one I tried and I can assure you it works wonders, but you can also check this site out: Spécifique: Solutions for Imbalance Scalp by Kérastase
As you can see they are very expensive products but at the time I thought it was worth the money (and I still do!). I hope you will be able to find something suitable in your area!