what gymtime said is correct, though a dose of about 1/3 of a cup has around 75 grams which is good. newayz the reason dextrose is chosen is because after you lift you have your "anabolic window of opportunity" so at this time your carbs will be absorbed the best, thus you want a quickly absorbing carb, dextrose is one of the highest on the gi scale behind maltodextrin, gi scale is glycemic index which is how quickly food is absorbed.