I take MuscleSpeed a half hour before going for runs and it is amazing! I feel alert and focused and just so Motivated to get out of the house and into my sneakers. I'm pretty sensitive to caffeine but this product really doesn't bother me or give me 'the shakes,' it's just pure energy and endurance. I can also run faster on this product, and push through the tougher parts with more confidence and improved cardio. \

It lasts a good 4-5 hours and it tapers off gently after that -- I can't say I've ever crashed on it. It comes in pill form which is convenient, because you don't have to mix anything. Plus, the full dose is two pills, for up to 4 pills a day, but I usually just take one because that's more than enough. With two I'm just bouncing off the wall!

Another good thing is that MuscleSpeed just gets better as time goes on -- I've noticed that with a lot of products you build a tolerance and need to take more, but it's been the opposite with Muscleespeed! The results are better each and every time. The one draw back is that it sometimes upsets my stomach. I used to take it before before breakfast, go for a run and come back and it -- bad idea! I now eat a light meal before I take it, and I haven't had a problem since. The product is worth it, hands down.