Hi, I'm 24 and used Zineryt when I was 18, it worked great for a couple of years. I would get the odd pimple here and there and during the time of the month, then it stopped working. I had a really bad breakout at the age of 20 and Zineryt didnt do anything for me so i stopped using it.
I've had a mad breakout in January which lasted a couple of month and is now under control but with loads of scars.
I personnly think Zineryt is great for normal pimples but not for the cystic type.
I'm happy you have found something that is helping you and hope you continue to see improvements.