# l- versus d-glucose

I recently purchased Dextrose from a local bulkfood store. I want to use it instead of table sugar. My concern is that it may be l-glucose instead of d-glucose. According to Wikipedia l-glucose is too expensive to produce but l-glucose produces laxative effects which is what I'm experiencing when I consume this dextrose.

Any tests I can do to check if it's truly d-glucose?

• – Mithoron Apr 14 '16 at 16:21

All that said, it's so exceedingly unlikely that you were sold l-glucose that it boggles the mind. First off, there's the labeling concern. "Dextrose" specifically means the d- isomer, so anyone selling l-glucose as dextrose is committing fraud. Secondly, the price differential is astronomical. Spot checking, from a chemical supplier l-glucose costs over \$50 per gram (so ~\$400 per teaspoon). In comparison, d-glucose of a similar grade from the same supplier is around \$0.04 per gram (so \$0.30 per teaspoon). With over a thousand-fold price differential, someone along the way would recognize if they were accidentally selling l-glucose.