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I have found these to work well when you get to the point that you could do with a boost. Usually around the 30 mile point for me. They are easy to digest and work quite quickly.
You've cycled 30 miles, and faced with tired legs and 20 miles to go, decide on an energy boost. This SIS Isotonic Gel does the job, and within 10 minutes of taking, gives you an incredible extra burst of energy. Well recomended!
Taste good, easy to digest, faffy opening tab
does what it says on the packet
I find these great for a 20-30 minute energy boost. They're not too thick and I really like the tropical flavour, although I'm not sure what its based on.