the dextrose is essentially sugar which causes an insulin spike. the insulin spike causes faster/greater absorbtion of the creatine monohydrate.
if grape juice isnt your thing you can also use apple juice.
this is very interesting to me
Don’t mix creatine with citrus juice. Orange, grapefruit, cranberry, in fact, most fruit juices have been most recently found to neutralize the activity of creatine monohydrate. The reason is the waste product creatinine develops. A lot of you put creatine on your tongue and drink it down with grapefruit juice. If you have taken creatine this way in the past, stop it now! You are not getting creatine, you’re getting waste product.
Do mix creatine monohydrate with warm water–in a glass. This is the only way to ensure you’re getting the full benefits of creatine in its dry form. Creatine does not have to dissolve to be effective.
take that into consideration.