From Fellrnr.com, Running tips
500px|From the top, clockwise are Gu, eGel, #9 chocolate, and Chia Surge. The Gu is representative of how the other not shown here gels look out of the packet. Here you can see the coloring in the eGel . The chocolate #9 is paste like rather than a gel. You can see the lumpy texture of Chia Surge.]]|[[File:Gels.jpg|none|thumb| 500px|Here the comparative the sizes of some of the gels.]]
[http://go.fellrnr.com/?id=35454X937677&xs=1&xcust=hammer&url=http%3A%2F%2Fwww.amazon.com%2FHammer-Single-Serve-Packets-Raspberry%2Fdp%2FB000RI2T4A Hammer Gel] is noteworthy as one of the easiest to digest gels. It is nearly all [[Maltodextrin]] dissolved in a greater volume of fluid than other gels. The low level of sugars and electrolytes makes this far easier on the digestive system, and is recommended for runners who have issues with other types of gel. Note the low level of Fructose, which makes the maximum carbohydrate absorption lower than other gels. Therefore use Hammer only if Gu is difficult to digest.