I take the Hammer Gel and I cant believe how fast it works. I did check out the label and it didn't say anywhere on there about caffeine though. I've been taking Heed and Perpetuem, for rides longer than 2 hours I was taking Whey, instead of breakfast and I just read where that's a no no. Your only suppost to take Whey after the ride. Anyway I think I have a pretty good combination now.