Craze? People have been taking creatine for decades. It's really well studied and is quite safe.

I saw someone handing out samples of creatine at Costco the other day, spouting all sorts of stuff like it's a wonder drug.

It's definitely becoming mainstream.

I've taken it off and on for the past 15 years, the most noticeable effect is about 5lbs of weight gain. I do think it helps gym performance and the increased water retention mames for better muscle definition.