Just bought these yesterday, invaluable on the trail. Never had cramp since using these! Usually £5-6....I usually get 3 rides out of one tube, 4 tablets per 3 litres.
Here's some info for the uneducated!
"NUUN the truly portable electrolyte source.
Every athlete knows the importance of hydration yet even if we set of on a long ride with two bottles we end up stopping at petrol stations and buying coke or sugar filled sports drinks or worse you fill your bottle with water and don't drink it when it gets warm and unpalatable.
Flavouring water encourages you to drink by up to 40% more compared to water alone
Nuuns small lightweight and waterproof tube holds 12 quickly dissolvable tablets that provide you with a fresh tasting sugar free electrolyte drink
Electrolytes are salts that conduct electricity and are found in the body fluid, tissue, and blood. Examples are calcium, magnesium, sodium, and potassium. Sodium (Na+) is concentrated in the extracellular fluid (ECF) and potassium (K+) is concentrated in the intracellular fluid (ICF). Proper balance is essential for muscle coordination, heart function, fluid absorption and excretion, nerve function, and concentration. "