I must admit, I have jumped on the celery juice bandwagon. I'm not sure if it is a craze but I can tell you this, I've been drinking it for over a month and I feel great. I used to have some stomach issues with bloating and such and that has subsided, besides that my hair and skin feel much better. So, whatever it's doing I'm going to continue drinking it, LOVE IT and it's results! Try it, I think you'll like it!
Here is a great article with great info