http://www.cranksports.com/products/eFuel/
http://www.cranksports.com/products/eGel/

My husband and I had issues with Cytomax, tummy did not like. We both experienced diarrhea.

The eGel/ eFuel has given us more energy to ride further and not have any tummy issue. Been using it for 2 1/2 years now.