Creatine doesn't stay stable in liquid, it will break down. This is the main reason why creatine sold in liquid or syrup forms for convient use are largely ineffective. Best thing to do if your going to take creatine and need a way to tote it around is to measure out the serving and put it in a small ziplock bag and just toss it in your pocket.
And Yes_Man is right. If you drink juice before your workout you will get an insulin spike, the insulin spike causes the nutrients to be quickly shuttled into the body, this is the reaction that you get from the insuling spike. That means whatever nutrients you had in your system digesting for use during your workout would be absorbed into your body and no longer available.
Same idea of eating alot of candy, then feeling a burst of energy then a crash. Fruit juice is really not the best choice for carbs for preworkout. You'll find that even unsweetened juices will tend to digest several times as quickly as their non-juice counterparts because they lack the extra stuff that slows down digestion. You can use oatmeal, whole wheat bread, or some other slow digesting carb source.
You also don't need to drink juice along with creatine, creatine works when your muscles are saturated with it. There are just two points of debate for creatine pre and post workout. If you were to take creatine preworkout, say an hour to 45 minutes before you workout, the creatine would digest during your workout so for that point, you would be using the creatine you took in to spare your body.
Post workout it gets shuttled in your system quick because you would normally drink juice with some protein. I honestly don't feel that much of a difference taking it preworkout, if your diet is in check you should be able to get through the routine fine.
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