Give us more context when you ask a question like this. Why do you think you need dextrose? Where'd you get that idea?
ETA: Questions like this don't really belong in the "All Things Gay" forum. To get your post to show up in the correct forum, after you click on "New Topic," you'll see the CATEGORY drop-down menu just above the "subject" box. In this instance you should select "General Fitness" from that menu.