Funny that this has been mentioned. I've been poking around the stores as of late to try and find someone that carries this product locally, but it looks like I'll just be ordering online.

I've used this product twice in the past; one ride was a climbing ride and the other was distance. I have to say I very definitely climbed and road well above average both times, and that had me convinced.

I didn't experience any side effects from use, other than kicking extra butt on the road =). Back then I had a riding partner and he noticed that I rode stronger both times as well.