Each carbon atom bearing a hydroxyl group -OH , with the exception of the first and last carbons, are asymmetric , making them stereo centers with two possible configurations each R or S. Fructose , or fruit sugar, is found in many plants and in humans, it is metabolized in the liver, absorbed directly into the intestines during digestion , and found in semen. The resulting possible pair of stereoisomers is called anomers. These elements— hydrogen , oxygen , carbon , nitrogen , phosphorus , and sulfur —form the core protoplasm of organisms, and the first four of these elements make up about 99 percent of the mass of most cells. Journal of Cerebral Blood Flow and Metabolism. Keep Exploring Britannica Animal.
Again, if you don't mind the jitters and all that jazz, it may be worth your time to check out the LipoVida brand.
Otherwise, Pure GCE gets my vote. Good product except the product isn't the best. I've tried a few different brands and this isn't the worst but it's not the best.