Price: $21.95
Web site: www.firstendurance.com

First Endurance, the makers of Ultragen and Optygen, also make an unbeatable electrolyte mix. Electrolyte Fuel System (EFS) is packed with all of the right ingredients to provide lasting energy during endurance events.

The bottom line: EFS provides 1,000mg per serving of all five of the essential electrolytes, eliminating the need for additional electrolyte supplements. It is a high glycemic mix of three carbohydrate sources, including glucose and sucrose. It is loaded with 2,000mg of amino acids per serving, including glutamine, leucine, iso-leucine, and valine. And finally, 200 percent RDA of vitamin C. Perhaps best of all, it is available in four delicious flavors that are not so sweet that they leave you craving water. Gluten free too.