Product makes you energetic and also keeps you from early muscle fatigue. One does need to take it and get used to it, stomach wise.
I do a bit less than the suggested dose and that works for me. My girlfriend also uses it on long rides and she loves it to!
It takes about 30 days but if you stay constant taking it, you will notice a difference. Most notable was the increase in endurance and stamina. Kind of expensive. Would only recommend for the season or working toward a event.