insulin

http://www.yourrunning.com/blog-stay_off_the_sugar

Ribose is great stuff. Yes, it's a sugar, but sugar's not always bad for you. This particular sugar has been heavily researched after early studies showed it seemed to be able to help revitailse extremely sick hearts.

After reading up on it, I made it a key part of the nutritional supplement program that supports me in training and racing when other men my age (present company excepted, of course) are settling down with a pipe and a cosy pair of slippers of an evening.