I recently took 2 GU Sports Roctane Ultra Endurance Energy Gels 15 minutes before a half marathon and as advertised received a huge energy boost about 40 minutes into the race that lasted me for 5 miles. This was a race I entered last minute and having had to deal with a pulled hamstring for 6 weeks this summer I needed all the help I could get. Had I known about these gels ahead of time I would taken a couple more with me to help finish the race in a little better shape. I definitely plan to incorporate these gels into my longer triathlon training and race days.
Triathlon For Beginners